It's not like American tech workers have high unemployment... Maybe some companies exploit the system, but your stance is extreme. We should promote importing talent. Maybe the system needs work, but it doesn't need to be eviscerated.
Access to jobs is a bedrock social justice issue in America.
If your company didn't have access to foreign H1-B guest workers, you would have two primary options: 1.) hire and train American workers, or 2.) recruit more aggressively by paying even higher wages. A wild guess on my part says that your company would hire the weaker candidates and train them.
I'm all for the first option, but the second option is okay too.
Or 3) offshore the work. This effectively gives smart people overseas on-the-job training, sends money into the economies of the nations of which they are citizens, and teaches them how to compete with US businesses.
Protectionism _never_ works.
That's a very convenient aphorism, but it's not true. There are thousands of laws in this country that do a great job protecting people. Intellectual property laws and labor laws are a great example of "domestic protectionism" if you will.
It's socially unjust to make American workers compete with foreign nationals for jobs. If the end game of a company is to simply offshore all their jobs, then they can also plan on giving up the benefits of being based in a stable democracy like the US. EX: it's highly unlikely that their assets will be nationalized.
Many of them notably more stable, in fact.
Face it, even cutting off H1-Bs entirely, which thankfully is not what is being proposed by Trump, would not make weak candidates attractive to hire.
Or you take a trip a few hours north and you get a stable democracy which will happily take in skilled workers.