The “liberals” here are more precisely “reformers.” These refromers evidently think of violent jihadists as “conservatives,” a nomenclature that is commonly used by the mainstream media, which picked it up motivated more by political intentions in America than by the realities of the Islamic world. These reformers “petition the U.N. to establish an international tribunal for the prosecution of terrorists.” From MEMRI:
On October 24, 2004, the liberal Arab websites www.elaph.com and www.metransparent.com published a manifesto written by Arab liberals, in which they petition the U.N. to establish an international tribunal which would prosecute terrorists, as well as people and institutions, primarily religious clerics, that incite terrorism. 
The idea to petition the U.N. with this request was raised by the Jordanian writer and researcher Dr. Shaker Al-Nabulsi in early September 2004, in response to the fatwa issued by Sheikh Yousef Al-Qaradhawi — one of the leaders of the Muslim Brotherhood movement and one of the most important religious authorities in Islamist circles — which called for the abduction and killing of U.S. citizens in Iraq.  The idea was developed and written up by Al-Nabulsi, Tunisian intellectual Al-‘Afif Al-Akhdhar, and former Iraqi Minister of Planning Dr. Jawad Hashem.
During the first 24 hours since the manifesto was published on the Internet, it was signed by approximately 2,000 people worldwide, including intellectuals, authors, poets, and journalists. The authors of the manifesto hope that within a week the number of signatures will reach 10,000, at which point it will be presented to the U.N.  The following are excerpts from the original English translation of the manifesto, as published by the authors:
Fatwas Are a Primary Cause of Terrorism
“Their Excellencies President and members of the UN-Security Council – His Excellency, The Secretary-General of the U.N.:
[…]”As you are deliberating to recommend practical measures to be imposed on individuals, groups, or entities involved in or associated with terrorist activities pursuant to Resolution 1566, we, the signatories of this letter, a group of Arab and Muslim liberals, would like to draw your attention to an extremely dangerous source of terrorism. This source is the purported religious pronouncements fatwa s issued by some psychotic members of dogmatic Muslims encouraging the commission of terrorist acts in the name of and under the banner of Islam.
“It is not enough for the Security Council to adopt resolutions ‘condemning’ terrorism. What will be more effective is the establishment of an International Tribunal affiliated to the UN organization for the prosecution of individuals, groups, or entities involved, directly or indirectly, with terrorist activities including, but not limited to, fatwa s issued by religious clerics in the name of Islam calling upon Muslims to commit terrorist acts.
“By these fatwa s all terrorists have died, or will die, fully convinced that they will immediately enter Paradise. Of course, we are not excluding other causes for committing terrorist acts, such as the ticking-bomb of population explosion with its resultant illiteracy, poverty, unemployment, backwardness in education systems, reactionary religious teaching, and, above all, living under dictatorial systems of governments in almost all Arab countries. But despite the above causes, certain religious fatwa s remain the pivotal cause of terrorist acts – fatwa s which clothe such terrorist acts with legitimacy as being one of the sacred tenets of Muslim faith.”
Examples of Fatwas
“We can provide you with an exhaustive lists of fatwa s which incite terrorist acts, but the following few may suffice:
Â· “When the presiding judge of the Egyptian Court asked Sheikh Mohamed Al-Ghazali (a leader in the Egyptian Muslim Brotherhood movement) to opine about the murder of Faraj Foda (an Egyptian secular intellectual) in 1992, Sheikh Al-Ghazali’s opinion was, ‘The killing of Faraj Foda was in fact the implementation of the punishment against an apostate which the imam (the state) has failed to implement (undertake).’ When the defendant heard Al-Ghazali’s opinion he shouted, ‘Now I will die with a clear conscience(for murdering Mr. Foda).’
Â· “On February 13, 2002, the London-based Al-Hayat newspapers published a fatwa issued by the Saudi Sheikh Ali Bin Khodair Al-Khodhari approving and condoning Al-Qa’ida’s 9/11 terrorist acts in New York and Washington. In his fatwa, the Sheikh said, ‘It is astonishing to mourn the [American] victims as being innocents. Those victims may be classified as infidel Americans which do not deserve being mourned, because each American, as to his relation to American government, is a warrior, or supporter, in money or opinion. It is legitimate to kill all of them as combatant; or non-combatant, such as the old, the blind, or non-Muslims”¦’
Â· “On February 13, 2002, the London-based Al-Hayat newspaper also published another fatwa issued by the Saudi Sheikh Safar Bin Abdulrahman Al-Hawali in which he described the 9/11 attacks as an equivalent given in return for President Clinton missile attack on Al-Qa’ida’s training camps after the terrorists attach on the American Embassy in Nairobi, Kenya. He went on to condone the attack on the World Trade Center and the Pentagon describing them as centers for money laundering, devil’s nest, spying cell, and a mafia retreat.
Â· “The fatwa issued by Sheikh Yousef Al-Qaradhawi permitting the killing of ‘fetuses’ (unborn) Jews, because (according to him) when Jews are born and grown-up they will join the Israeli army. Furthermore, on September 3, 2004, (at the Egyptian Journalist Union) Al-Qardhawi issued a fatwa to kill all American civilians working in Iraq.
Â· “And on July 3, 2004, he issued another fatwa (published in Al-Ahram Al-Arabi ) permitting the killing of Muslim intellectuals as being apostates, claiming that Islam justify the killing of such apostates. The fatwa issued by Rashid Al-Ghannoushi (Tunisian) according to which he permits killing all civilians in Israel, because (according to his fatwa ) ‘these are no civilians in Israel. The population “” males, females, and children “” is the army reserve soldiers, thus could be killed.”
‘Fatwas Issued by the Extremist Muslims Clerics Encourage the Commission of Terrorist Acts’
“As it is difficult, if not impossible, to prosecute these extremists in their native Arab or Islamic countries, they continue to issue and publish their fatwa s inciting acts of terror under the false umbrella of Islam. As the fatwa s issued by the extremist Muslims clerics encourage the commission of terrorist acts to provoke a state of terror, and, due to the importance of combating terrorism as a matter of urgency, we, the signatories of this letter, respectfully submit to your excellencies and to the Working Group Constituted pursuant to Article-9 of Resolution 1566 to create an International Tribunal to prosecute all terrorists, whether individuals, groups, or entities, including individuals who incite terrorism through the issuance of fatwa s in the name of religion.”