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/// At the moment, no-one is pretending it is not there, but the proposal to ban extremist speakers will lead directly to the accusations that the government is doing just that. ///
I don't quite follow you, the government want to bring in these measures because it has been proven that it is there, the only ones that are pretending it is not there, are those who oppose the governments plans to enforce this ban.
/// Such as speaking on university campuses? ///
I think that the word 'campus' wasn't just talking about the grounds of the university, but inside the buildings as well.
/// Ideal! The best way to expose these lunatics for what they are, is for their rhetoric to reach as wide an audience as possible - ///
Even if they did their preaching outdoors (in the grounds of the university), it wouldn't reach as wide an audience as possible, it would only attract an audience of susceptible students, whereas if they did their preaching in public, the police could make sure that they didn't break any laws.