Because we have a long history of overthrowing governments and installing puppet regimes in their place. For all the talk about Democracy, the US has a long history of backing dictators, such as Batista, Marcos, the Shah, and so forth, who oppressed their people for the benefit of American corporations until their people rebelled and regained their freedoms. Then the US labels those freedom fighters as "terrorists" to try to regain control.

Want to stop terrorism?

Stop screwing around with other people's countries and the terrorists will go home. Contrary to the corporate interests that rule this nation, terrorists don't hate us because we are free. People everywhere love freedom. Only governments hate people who are free. The terrorists hate the US because the US government is trying to take their freedom away, as happened when the US toppled democratically elected Allende and installed the dictator Pinochet in his place. Nobody likes another country to come in and mess with their country. We certainly do not like it happening here, so why should other people be any different?

Terrorism is the bastard child of US foreign policy mated with US corporate greed.