The problem being we basically know that's not how it works.

If you push them underground, the main result is fewer Nazis. Intentionally platforming them helps them maintain a facade of normalcy that makes it WAY easier to recruit people into the organizations and further radicalize them. Not to mention the simple amplification effect of having a platform.

The idea that the underground Nazis are going to be a more distilled, pure, volatile form of Nazi SOUNDS theoretically sensible. But if that's your argument, the burden of proof is on you to demonstrate it actually happens. And even if it sometimes does, if there's only 10 of them it barely matters.

The simplest solution, to shut down the recruitment pipeline, is also the correct choice for a platform operator to make.