The social blanket will cushion their bad decisions, so why bother making the right decision's
And there is the ultimate flaw in our society.
Replacing our population with immigration is not a solution to our problem that we no longer produce anything. Not even our own children.
Ironically, allowing more immigration would probably raise the birth rate among the native population. By blocking immigration, we stagnate the economy. As a result, workers in precarious jobs hold off on having children, and this results in a vicious cycle of further economic stagnation and holding off.
Allowing more immigration grows the economy, creates jobs and economic stability, and consequently can motivate the native population to have more children.
When you think about, it, people react rationally to the marketplace, even when it comes to having children. The more open the market, the better for the most part.