Earlier quoted context omitted.
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The Germans came for the Nazis. The Weimar Republic was very much in favor of imprisoning them for their (detestable) ideals and proposals. The Nazis were able to parlay this persecution (and Weimar failures) into an increasing share of the electorate and eventually total control.
This was what Marcuse was getting at in "Repressive Tolerance". Some views deserve free expression. Others do not. If you give free expression to all perspectives, the vile ones will spread until you can't control them anymore, and then you're no longer a tolerant society but a repressive one.
We have the means and now the will to identify vile speech online and shut it down at the network level.