I think some people are not seeing what it is because they are looking at only 1 issue. It's is not only "stop the boats". It is continuing push against immigrants and anyone "other".
It started years ago, referendum opened gates for many normally unpalatable opinions and actions, then they added bit there, bot over there and now this.
Again, coupled with current economic issues (that is why the ideas caught up well in Germany that time as well), the blame and invitation for open hate of immigrants no matter what education and how they got here, just to move blame for the decline of UK from leaders...
I had so many arguments about free houses for all immigrants, it's mind boggling. Or the "taking all the scarce resources". Why do people think the resources are getting scarcer. (No one is getting anything free really and resources are scarcer because it shite work and people are leaving it....)
In essence, immigrants, asylum seekers and everyone who doesn't fit as "western european" is being scapegoated to get blame for government's austerity results. As I said. Wait for next year when it will show what they did with the latest bills around break up from EU, how much that will cost and where will the money be coming from. Hint. The vulnerable. But it will of course be the fault of immigrants. We are the current folk devil. Like single mothers were (taking all benefits and having kids on purpose for benefits).
We are nearly on the last step of the latest folk devil creation. (Or more like recreation since immigration is repeated in circles)
If you repeat something continuously and with enough conviction, people will believe it at the end. So by next GE a lot of people will be fully convinced it's not austerity results, it's them bloody immigrants and asylum seekers
If that makes sense