@Putin
"But the leaders stepped down peacefully in virtually all cases."
That’s an interesting but myopic viewpoint. Shouldn't the credit for being peaceful go to the pro-democracy demonstrators who ousted their communist dictators? I mean at this point there was little the communists could do, even their own militaries had turned on them. Sure they stepped down peacefully; what choice did they have? The only one who refused was tried and executed.
But in claiming that these communists were interested in sharing power or were somehow interested in the welfare of their fellow man so they stepped down peacefully is misleading if not an outright falsehood. You are conveniently overlooking the 1953 German Uprising, the 1956 Hungarian Revolution, and the 1968 Invasion of Czechoslovakia.
-When East Germans decided they'd had enough of communism and went on strike the Soviets responded by bringing in 16 Soviet divisions killing 21 people and then arresting 20,000 40 of whom were executed.
-When the Hungarians had had enough of Communism in 1956 and actually overthrew their government through protests. It was the AVH who fired upon the Hungarian protesters and ignited a violent revolution in which 2,500 Hungarians and 772 Soviet troops were killed (Soviet troops, not Hungarian troops, it was the Soviets not the Hungarians who largely want communism in Hungary).
-Then when the Czechs wanted a little more liberalism in the form of increased freedom of speech, freedom of the press, and freedom of movement; the Soviets invoked the Brezhnev doctrine to invade them, with the help of four other Eastern Bloc countries. The Brezhnev doctrine asserted the right of the USSR to intervene if any of its satellite states appeared to be moving toward capitalism.
Soviet style communism was a failure. It was so unpopular that it doesn't exist anymore. They didn't need the capitalist west to bring them down. It was their citizens who did brought them down. The Eastern Bloc was kept in line as long as the Soviets were strong enough to keep them in line. The people embraced freedom at the first opportunity to do so. They had tried it earlier in 1953 just after Stalin’s death and were summarily put down. As soon as the USSR showed that it was no longer strong enough to exert power over them, they abandoned Communism.