I have no doubt this act was meant to terrorize and when someone uses an airplane to crash into a federal building and kills people is is obviously terrorism. If he had yelled "Allah o Akbar!" instead of "Fuck the IRS!" would anyone be discussing this?
I've seen reaction online that is calling this terrorist madman a "martyr," an American hero. Lemme tell ya: the right wing in this country is one fucked up bunch of people.