Milton Friedman makes the point in Capitalism & Freedom that if instead of a presumption to free speech, a society chose to prohibit or allow free speech depending on the particular view being advocated, then it is likely that most minority viewpoints could be outlawed. Yet by grouping all minority viewpoints together you ensure that most people sympathise with at least sum of those viewpoints and don't want their free speech to be curtailed, therefore they support free speech in general.
This being the case it really is a very good thing that the government has released it's list of 'Britain's least wanted', a bewilderingly diverse list that includes everyone from Islamists to US talk show hosts. The criteria for banning someone is so arbitary that it could easily be used to simply ban anyone the government of the day disapproves of.
They really couldn't have done more to create opposition to these powers they have acquired.
There is a strong case for banning people who advocate violence but beyond that what someone is likely to say is no reason for barring them from this country.
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