But you should still not spread misinformation. Also, America _has_ been accused of worse things than the Cambodian genocide (as far as genocides can be compared, but I'm following your lead on comparing atrocities here): take the genocide of the indigenous American population for one.
But you're extrapolating quite a bit here. Could you please 1) provide the reference for this "provoke"-bit, so that we can evaluate it ourselves, and 2) explain exactly what the damning evidence is.
Show me the smoking gun, please.