People should only be banned from visiting the UK to argue their political case, if it likely that they will commit crimes here. However we see the power of exclusion used against people simply because the government disapproves of their opinions or they may cause the government embarrassment.
New Labour’s exclusion policy is but one aspect of its attack on civil liberties.
What I think is not sufficiently understood is that exclusion does not just take way rights from the excluded person, but from the British people who invited them or who want to meet them.
I think Wilders, for instance, is a bigoted rightwing twit. But why should those who want to talk to him in person have to travel to the Netherlands to do so? Imagine the outcry if the Netherlands responded by following New Labour’s example and banning British parliamentarians.
The exclusion of nasty, but non-criminal, people from the UK threatens British freedom.