Yes, I know that Saddam Hussein committed his worst atrocities when he was our ally. Unfortunately, that sort of moral equivalency didn't really have that much traction. We supported him, yet we went to war against him, twice.
I wanted to find some paralell of a country doing something very similar where it did not experience invasion, sanctions, etc..
Indonesia fits that bill.
It's better to argue that mass murder only counts when it's convenient for the U.S.' interest beause it makes the connection more immediate; arguing about who our 'allies' were in the 1980s is much less likely to have the same impact.