In revenge for the invasion of Afghanistan. But 9/11, of course, preceded that invasion, and provoked it. So 9/11 was in revenge for something else. And if the West keeps daring to resist the mujahedin, they will find more pretexts for revenge. The only way we could take away their thirst for revenge would be to stop resisting them in any way.
From AFP, with thanks to DFS:
LONDON : Afghan militants are planning to launch deadly attacks on civilians in Europe in revenge for the 2001 invasion by US-led forces, a Taliban commander said on Sky News television on Monday.
Mullah Mohammed Amin said resurgent militants had built up stockpiles of weapons and were bent on vengeance against “the foreign invaders”.
The Taliban, overthrown by the invasion, now wanted to export terror to the West, he said.
“It’s acceptable to kill ordinary people in Europe because these are the people who have voted in the government,” he said.
“They came to our home and attacked our women and children,” he added. “The ordinary people of these countries are behind this – so we will not spare them. We will kill them and laugh over them like they are killing us and laughing at us.”
Amin said the Taliban was inspired by tactics used by insurgents in Iraq, namely remote-controlled bombs, land mines and suicide bombers.
“They are our best tactic,” he said.