This is the kind of thinking that led the US to support murderous mujaheddeen against the Soviet Union in Afghanistan. What followed from that, we all know. It is OK to ally oneself with Stalin when one is trying to survive Hitler, but to assume that one has to take part in any monstrous struggle between monsters is plain stupid. When the struggle is between murderers, and when no desperate national interest is concerned, it is better not to be involved at all.