If you don't mind spending a few dollars, you can get your/a lawyer to send her a "cease and desist" letter regarding her behavior, which may or may not be effective but at least lets her know you mean business and aren't going to put up with her BS anymore. 

And I don't expect one, as his offer and hiw behavior fits the criteria that @Mindy Jensen describes.

And if we (landlords) just accept these kinds of behaviors - we are going to end up with more and more tenants that just don't give a @#$%!

Have you noticed that the topics that have the word "ethics" in the title almost always ask for opinions about behavior that is clearly unethical?

While I responded as promptly as my schedule allowed with answers to the best of my knowledge, it slowly became clear to me that what I mistook for conscientiousness in the application process was actually an extreme sense of entitlement and compulsive need for control (red-flag #3).

Which I understand is a condition often studied in psychology and behavioral economics.Cheers

They could be fake.He might be trying to stop bad behavior in area.I would just ask him what's going on.

Get a feel for them, see how they park, where they park (if on your curb or respectfully across the street), etiquette, mannerism, the way they speak, how behaved their children are (This is a big one, often a reflection of their parents behavior), you can also see their credit which is a big factor, look at the way they address you.

I think you are setting yourself up for a bunch of failures after observing borrower behavior for years.  

When I lived in Kailua Kona for 8 years, there was definitely a lot more riff-raff and low-class behavior than I had ever been exposed to.