@markvonwahlde as someone who used to subscribe to this nonsense take: the true history of antifascism involves physical resistance as part of a diversity of tactics, e.g. see Dave Hann's book of that name https://www.goodreads.com/book/show/17221692-physical-resistance
As to why this is, consider how effective fascists are at presenting themselves as providing safety if they lose streetfights, and how much physical harm they're able to cause when not resisted (e.g. look at the EDL in Luton in the UK in 2011) - especially given the police collaboration that you currently point out.
@markvonwahlde @antifaintl Unfortunately when it comes to fascism there's no easy solution. There will always be collateral damage. The important thing is stopping nazis and mitigating harm to nazi victims as much as possible. Some people are going to be hurt no matter what because there is no simple solution.
That's why fascism must be uprooted as soon as it sprouts. Because if it grows enough you can't chop it down without crushing something.