I don't know what the research shows, but my intuition says that especially for people in lower socioeconomic classes, many of these things just don't apply, because of the scarcity of money all around.
A landlord in a lower income housing situation might be themselves strapped for cash and rely more on that income (as opposed to this being their second investment home), so might be less forgiving of you missing your rent. And people live more paycheck to paycheck.
It's hard to remember how much uncertainty there was last spring, about how long this would last, how many would die, or just how catastrophically our economy would collapse.
I don't fault the government at all for hastily putting this together. But as others have said, that doesn't mean they shouldn't go after fraudsters now that we have some breathing room.
Full disclosure: my 2 person company received a PPP loan and it helped us for the period that it did, especially because our city government client took all of our contract's funds for COVID relief.