Like, he doesn't see the malice in other people, but its not because he's innocent/naive of such intents, nor does he lack the skills to look for it (guileless), but because (as you say) he doesn't care if people take advantage of him, up to a limit.
Properly calibrated, that's really admirable.
The hedge fund thing is way overblown. Even if they buy up homes in hot markets, their incentive is still going to be to sell them if/when the market cools. Corporations do not enjoy the same tax incentives as homeowners in this country, and the risks/costs to rent out older homes just doesn't pen out for non-local investors. If PE wants to get into housing, it's such a better deal for them to just build apartments.
Currently less than a percent of homes are owned by private equity. And the majority of those are owned for the purpose of turning around and selling them, like Home Partners.
(Zillow also tried buying up homes for the purpose of arbitrage and it ended up blowing up in their face).
I think the reality is that the main component of investor pressure is from people who hold onto an overly large/well placed home far past the point of utility, because they want to sell as late as possible and maximize their return. Follow that with small-time landlords, and then finally actual explicit investors buying homes as some kind of commodity. A lot of the dysfunction of capitalism (so-called "late stage capitalism") is induced by people trying to outsmart the market, time the market, etc. when they really don't have the knowledge or information to play such games.