"that they felt free to do so is entirely the fault of this President." Nonsense. It is "the fault" of the Constitution which allows peaceful demonstrations, even Nazi ones.

It is the counter-demonstrators coming ready to rumble that is giving them publicity and encouraging them to continue. Seeing that they are really getting under their opponents, skin, and making national headlines, is what will attract more disaffected young men, it what ensures this will keep escalating. Everyone's having fun, look at the grins on the young men rumbling! How often do they get the chance to actually have a street fight, with all the testosterone and adrenaline flowing?