Just so we're clear, I chose the word "scum" carefully, and the equation with child molesters even more so. I indulge on occasion in hyperbole. This is not such an occasion.
I mean, I guess there's no reason to suppose a correlation above coincidence between neo-Nazi stupidity and actual child molesting, but in terms of bringing nothing but uselessness and image damage to a larger movement which actually does have value, NAMBLA and neo-Nazis are indistinguishable.
At this point, considering the amount of political hay the progressive media is making out of those assholes, I'm coming more and more to suspect that they're the Trojan horses. False-flagging is a time-honored tactic on the left, after all, and considering the recent testing of the waters toward a "reevaluation" of pedophilia as a sexual orientation harmless in its own right, there is literally no better ideological weapon imaginable against the alt-right than to be able to paint it as a modern resurgence of Nazi fascism.
On the other hand, it's not hard to imagine there actually are some people out there dumb enough to assume that anything progressives think is bad must ipso facto therefore be good. Hanlon's razor applies here as everywhere else, of course, but even in that case, the very kindest accurate description of "alt-right" neo-Nazis would be as useful idiots.