> the borders would have to gradually transition to fully open, sure, but after that transition the borders could be fully open.

Why is a transition period needed? If you believe that, then fundamentally we agree, we just differ on the rate at which immigrants should be let in. Why not just let literally anyone who wants to live here move here right now?

I don't necessarily think they will ruin the US, but I certainly don't know it with the degree of certainty required for such an irreversible decision.