With apologies to smjjames, I'll stop right after this last post. Something something hope they don't repeal ACA this time around.
I disagree. I think Harry has the right intentions, but he hasn't actually demonstrated or shown any sources that demonstrate that reality does in fact work the way he suggests it works. Other posters have mentioned (I forget whom sorry and am too tired to check all posts) that the type of tactics used actually strengthen the fringe groups mentioned.
It's an idea rooted in the
paradox of tolerance, which is the thought that you shouldn't let people who want to shit in your well have access to it in the interests of those who'd like to drink from it - to protect the tools we use to ensure tolerance they must logically be insulated from intolerant forces making use of them in bad faith. Nazis fortunately are just about the most obviously bad faith group out there, so luckily we can skip the part where we deem them unworthy from on high.
And I wasn't really advocating punching Nazis specifically, just explaining the rationale behind ostracizing Nazis, of which punching is a completely nonessential part (identifying Nazi-allied rhetoric and appropriately calling that shit out, taking a unified front against it, that's the key part).
But it's weird you should mention sources since:
Think about other groups with victimhood conspiracy theories or self-identities, how do they react when people are openly hostile? e.g. for example if men are more hostile to radical feminists, does that in fact make them less radical feminists? Or does it make them more radical feminists? Of couse the latter is true. If a theory is self-evident it should also be universal, e.g. if you say "punch a nazi" suppresses Nazis but the same attitude doesn't suppress other groups such as Radfems, then you need to have a coherent theory explaining the difference, or you're merely appealling to special pleading.
Feminism is an interesting example of ostracism and abuse being effective for a terrible purpose - feminists have been dragged collectively through the mud so hard in recent years (not helped by the occasional bad feminist, but bad feminists have always been a thing and this hasn't really changed significantly in recent years) that according to your own source feminism is about as popular as the goddamn K.K.K.! The credibility of feminism in popular discourse - at least when outright described as feminism - seems to be at an all-time low as a direct result of the mobilization and tireless activism of perhaps as few as ten thousand dedicated internet shitlords!
Remember, the point is to exclude Nazis, not convert them, and make sure Nazism, white nationalism, racial realism, the Great Replacement and any other cockamamie bullshit they come up with become and/or remain unusable in discourse much like how the very notion of feminism provokes eyerolls from people today. Essentially, make sure the fringe remains the fringe and doesn't contaminate the broader pool, which is unfortunately already happening with Trump's election.