As I've said before, America has not been attacked by another country since WWII, and yet we've been in almost continuous wars since then - large and small. Who starts our wars? Obviously, we do, and name the war that has been well-justified and fruitful. I say this as someone who spent 2 1/2 years flying combat missions, so I'm not just a sidelines critic.
And even ww2, nobody was clean. How could others permit for the occupation of other countries? Only when it affected them did anyone make a move. Germany was hailed as the liberators by many in the United States. So not all is clean sadly either