[ue_]

I'd wager a variety of factors, including post-collapse suppression of Communist ideas, the legacy of the Soviet Union which is regarded poorly in many eastern European countries, and disillusionment with Marxism-Leninism, or at least, Soviet-style state capitalism.

In countries in which there has been no "Socialist" past, many people see Socialism as a realistic option given modern Communist philosophers. That is to say, this is because aside from McCarthyist red scare legacy, there is less stigma.