These folks do not seem to place much emphasis on the neighbor's failure to seek recourse through the authorities, instead suggesting the landlord should offer herself up as the first port of call to neighbors when an allegation of tenant misbehavior arises.Others would argue that the landlord has no such duty and that adults should behave rationally and, if necessary, permit the authorities to resolve such issues according to official processes.

Haha ;) In our larger properties, 2+ bedrooms, the long-term tenant is sometimes comfortable with staying in a shared AirBnB bedroom (shared female or male only rooms).

By the time they are adults, they are who they are, and they always will be.

It's about addressing things and solving them together like adults.

Even though I braved some of the worse parts of the city of Houston, TX as a child, I wouldn't dare househack in the same neighborhoods as an adult.

They are both living there and they're both adults put them both on the lease.

Could a parent buy a home for their adult child (who could not afford it on their own) to live in and get the same 5% down/owner occupied financing rates?

But allowing people to live this way, not teaching them to be  responsible  adults is not helping them.  

The one Sheriff at the door literally grabbed him by his shirt and placed in on the sidewalk outside the front door and he stepped inside. 30 seconds later, saw four adults leave the house - nothing was packed - after 5 months of hell from these people.

For me, I would never put a male roommate with 3 female roommates, where the 3 female roommates did not give their approval and do not know the guy.