Right all those people enabling the rich to get richer by paying for work well below market rate. While the politicians the wealthy overwhelmingly support out side of notable Billionaires, get a crop of new voters when those people have children. Voters who are utterly dependent on them and entirely free of any commitment to our national cultural heritage.
All those SS and medicare contributions, won't mean a thing because those programs are STILL demographically upside down even with them. Not to mention they really only help once again the already very wealthy pay people less than real cost of living for their labor - it is literally just more wealth transfer. We don't have the problem of 1930 anymore, we don't need older workers to retire to make room for younger more productive bodies; we have almost the opposite problem!
Take care of you in your dotage, you should have actually contributed to society and had some children if that is your concern.
Mass immigration does nothing but pour gasoline on social stratification. Even if it does enable growth, this has always been true, it was true in gilded age it is true now. The US does not really have a wealth and productivity problem right now. If we did immigration might be a sensible policy, we do have social stratification problem, so the correct policy choice is clearly to reduce immigration.
The person that needs to grow brain or at least us it, can be found in your nearest mirror. This nation's problems are because an entire generation can't let go of the dogma of 1960. Either they grew up in the 1960s or the got 'educated' by people who did and they can't or won't see the landscape has changed.
GDP impact is a fine measure for looking at the impact of some narrow policy choices, but people continue to act like it strongly correlates with mean-individual well being. It hasn't for a long time, but generations of economists can't let go of theories developed by Great Depression survivors, who at the time were right about "Bro You gotta pump them top line numbers" we are not there today.