Why do so many people hate LEGAL immigration?

Why do so many people hate LEGAL immigration?

I've helped more than a few people immigrate to the USA, and it's not easy. But they all had to go through criminal background checks and medical checks. Why are so many on the left apposed to common sense rules? Do you really want drugs and drug dealers crossing the border? Do you want terrorists crossing the border? Why not just win the vote by legal means? Democrats used to be able to come up with ideas and get votes, but now they've all turned to shady means.

Why do so many people hate LEGAL immigration?
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