you're choosing the side of oppression. It's a stark either/or choice. When you let fascists have a free run without opposition you HELP them recruit.
Most people don't realize that fascists aren't trying to be "fair" and aren't trying to win some sort of "debate". Their two-fold agenda with these marches is to appeal to the WORST of human emotions and prejudice AND intimidate with the threat of violence ANYBODY (including liberals and not just Antifa) who don't agree with them. This brings into their orbit people who agree with them, but are nervous about admitting it. Hence it's a recruiting tool which grows their movement. And every time they are ALLOWED to march WITHOUT a counter, they and their supporters consider it a win because they WILL gain supporters from it.
That's history talking BTW, not just me. That's the exact way that the Nazis gained power in the early stages in Germany. They weren't a majority, but they were willing to do anything and appeal to anybody's worst instincts. And the liberals of the time had the exact same attitude towards anybody who opposed them and you do in your post.
Finally, you don't have to worry about the democrats distancing themselves. It's their nature to allow the right to flourish and then "compromise" with them. Unfortunately, fascists aren't compromisers. After they get rid of Antifa (with your help), communists, socialists, and the organized working class, THEN they'll come after the liberals. That's the history of fascist movements.