Migrants build a country. Every human is a source of power and wealth. We are wealth generators. Most people who want to migrate to a different "country" (part of the world) just want a better life. Most are more than willing to work - if the system in place would just let them, instead of treating them like criminals. These people could contribute their energy and build your community that you so treasure. That gated community needs people willing to maintain it for you? Or do you just prefer to pay more for labor by restricting the number of people participating in that community.

Makes no sense whatsoever.

And criminals - they exist in every community, all across the globe. We deal with those like any other. Migrants are not criminals. They are a resource.