It's because they don't really understand how economies work.

I tried to tell so many of these people you can't just turn the economy off and on like a light switch, but they didn't get it and wouldn't listen even if they did. It really is like a religion in all the worst ways.

To be clear, I'm not anti-religion. I'm just saying there are some less than savory aspects to religious practice, particularly organized religion, and socialists display all the worst traits, including dogmatic faith in their chosen "prophet."