Oh bullshit. Read a history book sometime. Nothing, and I do mean NOTHING, has ever gotten in the way of mans capacity to chop each other up. Take some of your handy, modern day rationalizations and explain WWI and WWII to me, please (including the part where we tried to stay the hell out of both). Explain the Korean War. Now....explain every empire from the dawn of time (Greek, Roman, Sassanid, Persian, Ottoman, etc.) Explain the purges of Stalin and Pol Pot.
There is nothing new under the sun. Anyone thinks that changing the US's position in anything is going to keep people from hacking each other to death is clearly delusional. Or would you like to blame Bosnia on us too? How about South African apartheid?