The take home is that you cannot win this game. The only restraint that works is the actual cost and even that is almost meaningless when folks sell themselves into slavery in order to go. In fact over the past fifty years, it has become progressively easier to migrate and so hey have.
What drives migration is actually failure at home to provide sufficient employment. Who migrates out of Europe anymore? It is a rare European.
What this means though is that if we solve poverty on a global basis all immigration disappears unless actively promoted and supported.
I go because even though I am not going legally, even though maybe bad things happen, if I stay at home, for sure bad things happen.