This seems to be a bit of a straw man argument. While some people no doubt want those views silenced, that's not the correct approach and not one I see being advocated here.
On the other hand, it's perfectly legitimate to object to those views. Personally, I'd also like that discussion to be a constructive one, and I'm not sure that the whole "unwashed criminal hordes" rhetoric is really going to help with that. Nobody should be silenced, but likewise nobody should be free from criticism for views that we object to.