I'll forgive it just this once.
Oh, very true. I'm not sure that allowing objectionable views to be aired (at whatever level) prevents the possibility of reasoned public debate, though. Reasoned debate can also use unreasoned, unreasonable, objectionable opinion to inform itself just as much as it can use staid mainstream opinion.
By automatically excluding the extreme and objectionable aren't we likely to exclude the radical?
It can be but it doesn't have to be. No argument has to be delivered with reason though one would think that it ought to help its cause if it were put forward so.
That it doesn't is, probably, a deficiency of the audience. This doesn't excuse those putting forward their thoughts in such a way (indeed one could suggest that it is even more morally bankrupt that they do this because they see a clear opportunity and thus seek to exploit the power that may be obtained) but it may suggest a way out. It's an exit that seems rather obvious to me - education. Not the Blairite bollocks soundbite but real education - teaching people to think, to question and to decide for themselves.
Completely agree with both points in bold, especially the last line. Some of my work involves the US public education system - it's quite frightening.