We've had a theory around here for some time - and we're certainly not the only ones - that most of the young people who are gaga over Bernie Sanders and his socialist ideas are completely oblivious to the real history of socialism because they didn't live through it. They were born after the Cold War (or right at the tail end of it such that they don't remember it), and they're taken in by notions like "fairness" and "equality" without really understanding what happens when you invest the kind of power in government that politicians tell you is necessary to make all this happen.
A very well-written report in The Federalist by Emily Ekins and Joy Pullmann backs that up with some fairly recent polling, and offers some eye-opening insight on what millennials think socialism is: