The U.K. needs a system for family migration underpinned by three simple principles. One: that those who come here should do so on the basis of a genuine relationship. Two: that migrants should be able to pay their way. And three: that they are able to integrate into British society.
I take a very simple view that a violent extremist at some point previously been an extremist, and by definition is an extremist, so you do need to look at that non-violent extremism.