Interventionism, definitely.
Imagine the world if the US didn't aid Britain during WWII; Britain would have gone bankrupt before the Battle of Britain even started.
And yes, the US blockade of Japan made war more likely if not inevitable, but it certainly prevented the gobbling up of Asia by a Fascist power and proved the be favorable for US interests as well.
Now it is true that the Second Gulf War was a mistake in that Saddam Hussein wasn't connected to the 9/11 terrorists in any way, but that doesn't say unilateral military action is bad in itself.
While the consequences of misusing intervention can be grave, the possible consequences of non-intervention in the face of immenent threat to attack can be outright disastrous, as Neville Chamberlain proved.