Because people who you want to come and work in the UK won't bother coming if it's hostile. The quality immigrants will simply not bother turning up. There are not the British bodies to fill these roles.
Instead, you'll be left with the less desirable and desperate.
Do you really want a workforce of those who grudgingly turn up, or would you rather the happier workforce of those who can enjoy family life?
What about training local to do these jobs? Have you considered the fact that importing skilled labour from low income countries is a selfish act? The higher income country doesn't have to train these workers and the higher income country is creating a brain drain that leaves the low income country with one less skilled worker. You're effectively poaching talent from worse off countries.
They need skilled immigration. By making students be the target of short-sighted fear based policies, they make it clear to those students that Britain is not where they want to end up. They end up losing many of their potential brightest minds.
Keep in mind that due to the demographic crisis, countries are soon to be competing for them.
Also: immigration is good, and the grievance based policies that attacks immigrants while achieving marginal gains is dishonest.
Also: hacker news seems like it has a sea lion problem.
That's not very charitably of you. I asked you a plain question, because you stated a problem without the consequences. Don't assume everyone is in your little bubble.
https://www.google.com/amp/s/www.businesstoday.in/amp/latest...