They seem unwilling to accept that human nature will ALWAYS produce people who either don't want to put in the "equal" amount of work to get the "equal" share of whatever, or, people who will lie, cheat, and steal, to get their "fair share" (well, those people are out for more than their "fair share" :) ) And that's just at the single human level, throw it government, and there is NO WAY socialism will ever work the way these people think it can.