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The real question is whether intervention would actually prevent this kind of violence. The US has had some pretty spectacular failures overseas (Vietnam, Somalia, Iraq, Afganistan) which should give anyone pause when advocating a regular policy of invading other countries. Perhaps invading Rwanda or Sudan would have stopped the violence there, but it's pretty hard to know how it would have actually turned out. The UN has had one of its largest deployments in the DRC, but it's still an extremely violent place and has the highest rate of rape in the world. I would be all for international interventions if they actually worked, but the evidence for that is limited at best.
Of the places you listed, none of them were the fairly narrow situations I've been talking about. Vietnam was political, Somalia was aid to the famine stricken during a civil war (which we got too involved in), Iraq was a clusterfuck of reasons none of which was genocide, Afghanistan was a legitimate (in the eyes of most) invasion. I also wouldn't say Iraq and Afghanistan were spectacular failures, or even failures at all despite the very rough road they've been on (Unless you were talking about backing Iraq v Iran and Afghan v Soviets, but even in those cases they weren't the settings I was talking about).
I'm not advocating regularly invading countries. There are plenty of times when wars, civil and otherwise, play out without crimes against humanity. Even dictators should be generally left alone unless they pose an imminent threat or (In Libya's case) are clearly about to commit a war crime. Even the evidence of a war crime doesn't mean we invade. Iraq's gassing of the Kurds was classified as a genocide, but it was a one-time action. Invasion wouldn't have saved anyone's life and would have been the wrong response. Darfur and Rwanda went on for a while, long enough for us to intervene and make a difference.