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It's definitely part of the reason, but not the main reason. It is not a sufficient or necessary condition, but more people adds more weight for concern when there already is a concern. All I really care about is if there is a plan of action, not simply hope on their part. There might be an argument to stop them in terms of visiting the country (as in, their intent is "hit and run" propaganda), but I can't see why I should call something a threat if it isn't associated with imminent violence. Are you seriously missing how Hitler used violence to come to power? He toned it down a little bit after being imprisoned, but it's not like he came to power and then unleashed the violence. It wasn't anti-German belief that was ever the threat, it was the constant use of violence. Hitler basically got people to ignore the law (or rather, he got the right people to ignore the law), he didn't use the law of Germany to get his way.

There are plenty of good books on how the Nazis gained power, including Ominous Parallels. Street-brawling with communists is not how they took power. That's partly how they became more popular. But generally people loved Hitler's philosophy. They voted for the Nazis, made them the dominant party in the Reichstag. They passed the Enabling Act, giving Hitler dictatorial powers. Citizens were free to leave the country up until WW2. Very few left. In the end, Hitler didn't need to use violence. He was a brilliant speaker and wooed the masses.