pretty easy. over 50% of silicon valleys unicorns have an immigrant founder. if you cut off their ability to stay, you wouldn't have those companies, and there wouldn't be nearly as many high paying tech jobs.
That's preaching to the choir though. The people who need convincing aren't in silicon valley or even CA.
Oh, I was aiming at the people in this comment section that need convincing. On a site populated by people paid by SV companies you’d think it wouldn’t need explaining. And yet
"Your country wouldn't have jobs if you don't import the billionaire Epstein class that strip mines the working class!"