The minimum wage issue is a tragic example. If lawmakers pass a law mandating wages of $10 per hour, that is going to have a very bad effect on low-skilled workers who can only generate, say, $8 of revenue per hour.
You don't need to be a libertarian to realize this is a problem.
Catherine Rampell leans to the left, but she warned last year in the Washington Post about the danger of "helping" workers to the unemployment line:
…the left needs to think harder about the unintended consequences of… benevolent-seeming proposals. In isolation, each of these policies has the potential to make workers more costly to hire. Cumulatively, they almost certainly do.