It's widely suspected that this is part of the job of the Working Group on Financial Markets...

I would hope so.

https://www.federalreserve.gov/monetarypolicy/openmarket.htm

https://www.federalreserve.gov/aboutthefed/files/combinedfin...

It'd be a conspiracy theory, but one that was unlikely rather than crazy.

There is evidence that foreign central banks are active in the US markets though [0].

[0] https://www.cmegroup.com/company/membership/files/CBIPFAQ.pd...

Somewhat related, it's entirely possible that someday social security will be revamped to include equities similar to how Canada runs its pension plan.

The ideal time for this would be once the current house of cards world economy collapses. Could be 10-15 years off yet.