So, what do you propose to do with fascists, racists, etc? Kill them? Debate is an opportunity to get those people, who are probably very dissatisfied with life, on the right path. Removal from platforms leads to them creating their own, isolated groups that get ever more radicalised. Every view, however dumb it may be, is worthy of debate or of at least being seen (people are free to ignore it). Not all views are equally valid, of course, but the validity of views is determined precisely during debate and argumentation. I don’t support fascism, racism, etc but if there’s a shortcut to remove those views from the public, the same shortcut can be used to remove anything! That’s a clear route to authoritarianism.