Hmm.. how about the Russian's killing the Chechen people? Becuase they want independance? Hmmm.. the US government gave them 10 billion dollars to help kill their own people.

Or how about Rwanada in 1994? Where 800,000 civilians died? Big war that caused.

Chinese people died during the 60's. We really fought a big war with them over that one.

Genocide alone, albeit a good reason, is not exactly been the U.S.'s main focus in having a war. BTW the gulf war started when Saddam decided to invade Kuwait. That's not exactly killing your "own" people. And WWII happened around the world while the US sat back and watched. The only reason the US got into the war, was becuase Japan attacked Pearl Harbor. The US actually did nothing to stop the Nazi's until OUR people died. So.. you'll have to come up with better arguements then that.