problem is, people aren't having enough kids to have a stable population (2.1 children per couple), and with birthrates getting lower and lower, there's fewer young people supporting the needs of old people, which puts too much stress on the young, the only reason the US isn't seeing the ill effects is because of a lot of young immigrants seeking the "American Dream" and now that you've set a deportation hit on their heads they don't want to be here anymore, you quite literally set in place a self destruction policy