I'm more than happy to be challenged but reserve the right to assign credibility to the challenge. You asked certain questions, and I said that they're all answered in the books I suggested, which between them spend several hundred pages and use dozens of studies and an awful lot of data to get to the facts of migration rather than succumb to the ill-informed rhetoric that so often drives this debate.Nobody is right Bruce when it comes to opinions. Expect you believe you are so you feel the need to talk down to others thinking it makes you sound clever.
Funny how every time someone challenges you it turns into childish insults because you can't stand being challenged.
You might also use https://www.plutobooks.com/9780745341071/border-nation/ or https://link.springer.com/book/10.1007/978-3-030-63557-2 if it's a topic that really interests you and you want to learn more about it. It seems a wholly reasonable position to say that Leah Cowen or Bryan Caplan explain things in much more depth, and quite probably a lot more clarity, than I ever could on this forum.
I try my best to go where the evidence takes me, and where migration is concerned, the overwhelming evidence is that more migration is better. It's better for us, it's better for them, it's even better for the sending country.