From other countries where they get a degree at a University.
Sometimes it's our university and sometimes it's from their country. In either case our tax dollars don't help them out, unless you're suggesting that our tax dollars go to bail foreign students out as well.
I benefited society by hauling freight all over this state. What would our society be without truck drivers? You wouldn't be able to get food or other products from your stores. Yes, what I did helped society, but I didn't take the job as a social obligation. I went into that field of work to benefit myself, and nobody should have to pay me other than my employer for it. If you want to be a truck driver, go to tractor-trailer school, pay for it, get your license, and then some experience.
In other words many of us have jobs that benefit society, but we aren't owned anything by taxpayers because of it, and neither should doctors or engineers.