The fact that someone saying Nazis should be run over is taken so serious as if that person is going to go out to perform vigilante justice is the problem.
I don't think we'll ever have the full context (i.e., exactly what was originally said, that got the commenter banned), so it's hard to say
Fair; I can see that. And no, I'm not incredibly familiar with the French Revolution at any more than a high level.
To bring it back to "hitting Nazis with cars", my position is that I don't trust the general public to appropriately identify and dish out appropriate justice to Nazis. "Identifying" them being a key part of that.