Well Palestinians were in the first attack on the WTC, Sirhan Sirhan was a Palestinian, Palestinians killed 24 Americans over here in the last couple of years, and Palestinians kidnapped our diplomats and killed them at Arafats direct order. And Palestinians are in Iraq attacking our troops to defend Sadam. The Palestinians have declared war on us (Jihad) and burn our flags and issue bountys for our civilian deaths. Some of Bin Laudins private guards are Palestinians. Palestinians killed the Marines in the Baracks bombing in Lebanon.
I am not sure what more they could do that would improve our position to declare war on them at this point.