The retreat to Voat was highly detrimental to the fascists because it massively hindered recruitment, the most effective form of which was to have moderator control of large subreddits not explicitly about politics, but saturated with far-right memes / "ironic" jokes, to slowly normalise and inculcate those ideas in people who are originally just there out of interest in some hobby. In contrast, very few people go to Voat who aren't already true believers. It's a much greater leap than from one subreddit to another.
> learning to accept that other people disagree with you and have contrary opinions is a much more robust solution
If there are people who believe in a Jewish conspiracy to destroy the white race through miscegenation, and they advocate for violent resistance in response, then "learning to accept" that is not in any way a solution.
> Inoculating the population to fascist rhetoric by publicly winning the debate against it with reasoned argument
Two points: (a) the overwhelming majority of political content consists of arguments presented without rebuttal. In the case of far-right content, it almost entirely consists of arguments against straw men, citing pseudoscience, deceitful abuse of statistics, and grandiose appeals to emotion. You can consume countless hours of content without actually encountering a genuine debate.
(b) Have you ever watched a debate between a fascist and a non-fascist? Even in response to comprehensive dismantling of their ideas, fascists remain completely insensible to facts (they can always fall back on "fake Jewish science") or reason. Some small fraction of viewers may be convinced by the debates, but the mere fact of something having been cogently debunked does very little overall.