The public, or at least the section that buys newspapers and gets onto the Question Time audience, seem to be in favor of this. Like a lot of people, they will vote in favor of repression so long as they think it's being done to someone else. Especially immigrants. You can even see it in the comments here.

"Tough on crime" and "tough on terrorism" are magic bullets for winning authoritarian support. That's how people are being persuaded that ECHR is a bad thing.