I appreciate and understand what you're saying, but there will be no well-thought out policy as long as the state of CA continues to openly and unabashedly offer everyone in Mexico free food, free housing, free phones, free health insurance and free education, all wrapped in a promise that you are safe from prosecution for pretty much anything you do.
That's California. Straight up. No BS. Until that stops, the only thing that will keep them out is a shitcanned US economy.