Jewish attorneys actually advocated for Nazis to be able to have marches. The phone you use has technology aided by Nazis... Anyone hear of Operation Paperclip? Wernher von Braun?
People dressed in Swastikas, speaking or marching are not violent acts themselves, those people may never become violent & may have no intention of being violent.
Most of them don't even believe Hitler murdered a bunch of Jews and that history was written by powerful Jews. It doesn't exactly help when Republicans & Democrats are loyal to Israel over America.
All & all, free speech laws in America are not rights to commit crime. Threats & violence are still criminal, and that goes both ways. Don't punch someone just cause they are wearing a Nazi outfit and think it is legal to do so... You may end up paying their medical bills & restitution.
America has litigated this multiple times & you had strong arguments from both sides, but in the end free speech won & I believe it was the right choice. I'd suggest you actually study history & those trials a bit more.
If you don't like it then file a lawsuit to change the law & make your case like normal productive people do instead of whining on the Internet about how you don't like things. If you don't like it then share the docket number of the lawsuit you've already filed to show you've done the work like countless people before you did to get the free speech we have today.
I see posts like this all the time, especially now that Trump & Republicans are trying to claim protesting Israel or their actions is antisemitic & should result in deportation. Nazism has went from being about being against Jews to being a Republican who loves Israel. Weird the people making a big deal about Nazis don't realize the irony.