I think the US should have intervened in Rwanda, only to prevent genocide and help refugees escape.
I think the key in this issue is the difference between genocide and run-of-the-mill civil war. I don't believe the US should intervene in conflicts within other countries. Civil war is a war between two groups of people in one country. Genocide is the systematic extermination of one group by another.
In the Rwandan genocide, I think the US should have taken action to stop genocide and help people escape. (Really, the UN should have done that, but whatever.)