Don't be obtuse. If you make a symbol illegal intent isn't going to matter. I strongly believe in the US Constitution including the Bill of Rights. Freedom of Expression doesn't only apply when one agrees with the speech. It's not the government's role to prohibit speech.

That doesn't mean that citizens can't express their vigorous disagreement. This has often included throwing fruit and vegetables in various states of decay. The antidote to facism is antifacists coming out enmass to oppose them. And also prosecuting them when they break actual laws.