I try to avoid calling anyone ignorant, and for good reason. It's because whenever I see that word tossed out it's usually done by people who don't know what they are talking about. So even if I know for a fact I'm not being a hypocrite, I usually try to avoid looking like one. But in some cases I believe the moniker fits, and might explain why anyone would try experimenting with socialism.

There are people who do not know and are unable to guess what the result can be, because they lack knowledge and/or experience. That fits the definition of ignorance, but it's only one explanation for the appeal of socialism and probably the not the main one. The main reason I believe socialism is still a popular idea is our old friend 'greed'. Greed is nastly little critter that ends up biting itself on it's own ass when no else is around, so it's not just a question of morality for the sake of morality... it's an immoral attitude because frankly it just doesn't work out in the long run. It looks appealing, and it appeals to our sense of greed, but beyond that it's useless.

Another possibility is if people are aware of the consequences and still want to give it a go, then they are clearly expecting a different result. One of the definitions of insanity is doing the same thing over and over again but expecting a different result... like me posting this message, but expecting to see a different kind of response...
*sigh*