You appear to be laying the groundwork for asserting that the allies should not have assisted the Soviets one iota during World War II, is that about right?
Not necessarily. There are definitely times in which we need to temporarily ally with bad regimes in order to take out some other bad one. In these cases we need to be extremely careful about what sort of arrangements we make with them, during and afterwards. And be very mindful of any ulterior motives that temp evil ally might have. ie, Putin seeking to use the situation in Syria as an opportunity to help restore the Soviet Union, or something similar to it and then-some with an expansion into the Middle East.