....if you remove these limits and just give EVERYONE benefits -- then you're going to enter a world which is more productive as they have the reason to be more productive. As they're not going to lose out if they attempt to progress.
This is incompatible with lax or unrestricted immigration of course. I know you restricted it to US citizens, just saying.
But a fundamental rule of government is that no programs are allowed to be considered which are not capable of supporting graft, corruption and political favoritism.