Oh so you're worried about the US becoming like Nazi Germany? And we should preempt that by gathering all the wrong thinkers, and then what do we do with them? Should we forcefully re-educate them? Or should we consider a more final solution?

If you honestly think that internet trolls and a few thousand neo-nazos (If that) is all it takes for a prosperous, first world nation to dissolve to a fascist nation that mass executes its own citizens than you need professional help.

So not only should we execute people who are hateful, we should throw in the un/mis-informed as well? You know I'd argue that climate change activists who protest nuclear energy against all logic and reasoning contribute a great amount to rising CO2 levels, should we throw them in as well? Or is it only the people YOU think are the enemies?

Absolutely no, there's no justification for initiating violence on a person, let alone a group of people who number in the millions, simply because they hold certain views. You can't justify that violence by saying "Well maybe if they say certain things people will get hurt" either. Do I really need to explain how horrible this stance is?

Initiating violence is morally acceptable if and only if you're protecting yourself, your property, or other people from immediate and tangible danger, not hypothetical future danger that might or might not occur.