You're not emigrating anywhere, lol. Should I be treated like trash when I move from Bronx to Queens? How about SoHo to Tribeca? All US citizens have the same rights and every vote counts the same as every other vote.
Should Juan be treated like trash if he wants to move from Mexico City or Honduras to Queens?
Why should you deny him that mobility? Is he any worse a person than you are? Why does he have to jump through hoops and quotas and queues and all sorts of degrading, dehumanizing bullshit before he can do so?
Why?
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If your answer is 'because that's the law and because we can make him jump through all those hoops', that's the answer to why cities choose to protect people who are existing residents at the expense of people who aren't. Because it's the law and because they can, if you don't like it, tough, you are free to go somewhere else.
Should Juan be treated like trash if he wants to move from Mexico City or Honduras to Queens?
Why should you deny him that mobility? Is he any worse a person than you are? Why does he have to jump through hoops and quotas and queues and all sorts of degrading, dehumanizing bullshit before he can do so?
Why?
---
If your answer is 'because that's the law and because we can make him jump through all those hoops', that's the answer to why cities choose to protect people who are existing residents at the expense of people who aren't. Because it's the law and because they can, if you don't like it, tough, you are free to go somewhere else.