Well, exactly. I'm betting that up until now, every public appearance made by such people is to a room full of people who already support them. Put them in a room of general electors and let them espouse their views, and let's see what happens then.

If in that case something they say crosses the line into illegal hate-speech, by all means the authorities should be notified. But we can't stop them appearing because we think they might do that. A bit Orwellian, that.