Yes, in the case of WW2 this is a "defense" war. But the next ones were not.

My comment was general - I am French and we send our army mostly to Africa to secure our sources of various minerals. Or to Asia in the 70s. We did not go to Iraq but that would have been another fight for oil (this time).

Western countries have not been attacked since WW2, but it also have been busy (same as the US)