Because America and Russia aren't still in a stalemate? Many who were high up within the Soviet government leadership network are now the leaders of modern Russia. Seeing that an ex-KGB agent is in control of the country would say otherwise about the cold war effective being 'won' or having ended.
The inefficiency of the Communist regimes and the people's dissatisfaction ultimately drove change. The west did not overthrow Ceausescu or bring about the dissolution of the Soviet Union. The Soviet Union collapsed as firstly the economic system was inefficient, their military spending was through the roof (the year before collapse in 1990, the Soviet Union had an estimated 37,000 nuclear weapons whereas America only had an estimated 11,000) and the Soviet Union had been embroiled in a war in Afghanistan for a decade. Therefore some reform needed to take place, which is where Gorbachev stepped in with his reforms which only helped to encourage and bring about the dissolution of the Soviet Union.
You wouldn't happen to be talking about the Syngman Rhee dictatorship the West installed in South Korea would you? It took over a decade for the South Korean people to overthrow the dictatorships the West installed and backed in South Korea (although sadly was replaced by another military dictatorship). The Syngman Rhee dictatorship was guilty of many massacres such as the Bodo League massacre where an estimated 100,000 Koreans were killed. It is also worth mentioning that the North Korean economy (based on GDP per capita) was actually larger than the South Korea's until the mid 1970's. So it is quite clear that the western backed dictatorship in South Korea was neither good for the South Korean economy nor was it a model for human rights or democracy.
Which is exactly my point. ISIS have done more the enough to give themselves negative press. But sadly there are many who seem them standing up to the West and opposing everything that many would perceive as bad and negative about the West. Our continued involvement helps to legitimise ISIS by providing them with innocent civilian deaths as propaganda. This article below is rather interesting in how it argues that the Islamism we are seeing emerging among many in the Middle East is effectively an Islamic liberation theology.
http://www.opednews.com/articles/Islam-as-Liberation-Theolo-by-Mike-Rivage-Seul-Faith_God_Islam_Islamaphobia-141012-698.htmlSome would argue that supporting Assad in the beginning could have achieved all of that far better and stopped the rise of ISIS and the persecution of such minority groups.
Maybe we need to try something different instead of continued wars and installing dictatorships in the Middle East? Maybe our current tactic just isn't working and maybe it might be worth attempting the redrawing of borders as an alternative way forward? Maybe giving ISIS their own state and redrawing borders so that the minority groups get their own state/s might be an option. ISIS want to set up their own state, but that cannot be achieved if they are constantly fighting. And the more we fight them, the more we help to provide them with propaganda with which to justify their existence.