>So if extremists start using a symbol, everyone else has to stop using it and let them have it?
If extremists start using a symbol, non-extremists have to accept that they might be associated with those extremists by continuing to use it.
>Wouldn't it be preferable to ignore the extremists so they don't get the symbol, and the symbol isn't ruined?
That's not how it works. They're using the symbol anyway, so it gets ruined anyway. Ignoring the Nazis would not have had prevented them from owning the meaning of the swastika in the Western world, to use the obvious example.
If extremists start using a symbol, non-extremists have to accept that they might be associated with those extremists by continuing to use it.
>Wouldn't it be preferable to ignore the extremists so they don't get the symbol, and the symbol isn't ruined?
That's not how it works. They're using the symbol anyway, so it gets ruined anyway. Ignoring the Nazis would not have had prevented them from owning the meaning of the swastika in the Western world, to use the obvious example.