I've only had to do this 5-6 times, but I won every time.I don't believe in punishing all future guests for the behavior of a rare few.

Very bogus behavior.

Will they "check themselves" from bad behavior when they see a professional company with professional services, legally reviewed lease, etc. managing their day-to-day?

That's spiteful or just out there- again not reasonable behavior.

If you can't help but reflexively defend property managers without knowing the issues, even when their behavior might be unprofessional, all I can say is this: Investors, please take note.

However, a lot of concerns can be mitigated with looking at their past rental behavior in a lot of different settings.

Yes, this type of behavior by law enforcement only creates more crime.

@Chris Seveney You are correct, taking the time to post to Better Business Bureau will result in nothing but possibly feeling a bit better (I say that seriously because of how human behavior works). 

It's a nice lesson in behavioral finance.

After dealing with this situation for quite some time I started studying scams, frauds then human behavior then cults.