Why do some people support wars?

There has been many wars in the last century, resulting in the death of thousands of patriotic soldiers and even innocent civilians, and the destruction of millions of tons of irreplaceable resources and they haven't solve a single thing. And most if not all of them are caused by economic interest of big corporations that look for any excuse to invade another country, an example is Iraq. the mere excuse for that war was the "terrorist attack" of 9/11, however there was no evidence of a link between the so called terrorist to osama bin laden but this didn't stop the US from invading iraq, now with the excuse that the Iraqis had nuclear weapons, so far there is absolutely no evidence of nuclear weapons even existing in Iraq. We know why the US is really there, the oil and other natural resources that Iraq has, not to mention, private contractors are making huge profits out of this war, but is it solving anything? No and it is not meant to solve anything the point is to make this war as long as possible to make the most profit. Know I ask why the hell do people support wars? With the excuse that "we are helping them gain freedom". I mean I think that if the people of a country want "freedom" they are solely responsible to gain it buy their own means and not by the intervention of another country.