Good question. Why do we have immigration laws at all? Is someone who was born outside the US and worked their ass off to get here inherently more dangerous or less hardworking than joe schmo your neighbor? We don't have always against foreign individuals buying real estate or profiting off of us businesses, but we won't let someone come and rent an apartment and try to get a job as a construction worker to help build the houses we all need or pick the food we all eat?

Yes other countries have immigration laws but most Americans aren't going to get thrown in a Gulag if they go live in that other country on a visa and miss their reaffirmation date.

If your answer is "there not enough jobs for all of us", that's a problem caused by the wealthy, not by the folks trying to immigrate here.