I'm trying to be generous here... but prisoner's dilemma says the people in a community are probably better to park their money outside of the community in order to protect (and grow) their retirement investments.

Yes, it would be better for the community if people chose to invest locally instead of the SnP 500, but running out of money in retirement is a very real fear and the SnP500 is much better/safer for most people than COIVs.