Timex is correct about Social Security: it’s a “transfer payment” system of social insurance, not a retirement investment plan. The perception that many people have is wrong, but many politicians for decades have treated Social Security as if it were a retirement investment plan.
Now, there is one way in which Social Security could work as an investment plan (but also like a pyramid scheme) - as long as the wage base of the economy (ie the number of workers times the average wage) keeps going up, then the income stream for the transfer payments also keeps going up. Some people have tried to describe this as “investing in the future American workforce” which is not correct: it’s relying on continued growth in the workforce and wages. I actually think a system like this is fine but in order to provide for a proper retirement without exponential workforce growth, I believe it would need to be supplemented by an actual investment system as well.
One idea is a “permanent personal 401K” type setup where every person gets assigned an account that is 100% transferable between jobs etc. with a small mandatory contribution, plus some matching from the feds for low income earners, and allowance for employer contribution, all tax free until withdrawal, with very limited rules for withdrawal: retirement, college education, maybe buying a first home or a business. The devil would be in the details, but something like that as a supplement to Social Security would probably be a big positive.