I know of no RE investor that had RE before the crash that did not exit that would agree with your statement including this investor.  

A crash?

I've seen landlords live in blissful ignorance for 5-10 years due to dumb luck, then their world comes crashing down and they lose everything.I have a book, there are some in the BP bookstore, or you can check out one of my personal favorites, Every Landlord's Legal Guide by NOLO.

.,) relative to all other applicants, but after showing them the property you have the distinct sense they'll be a difficult, high maintenance/game-the-system/treat-your-property-poorly tenant.Essentially: how do you stay on the right side of the law rejecting a tenant that appears to be the best applicant on paper, but to whom you don't want to rent based on unpleasant personal interactions or impressions that they would likely take poor care of your property?

Or did they crash into a zoo full of endangered species?

American Banks (like BofA and Wells) actually did lend in CR pre-2008 but that possibility disappeared after the crash.

Some will probably do fine with it, but the number of spectacular crashes amongst this demographic will be a multiple of the norm. 

The reality is that this isn't people crashing on the couch while we're out of town anymore. 

@Anthony Sigala that "Rule" was created for mostly Class B properties BEFORE the Great RE Crash of 2008-2010.Values after the Crash dropped so much, that it could also be used for Class A rentals.Values are now more than their pre-crash highs, so the rule now only applies to Class B & C rentals.How are you identifying Class B & C submarkets in your area, so you can properly apply the rule to the right rentals?

I also suggest a drive-by so they are not unpleasantly surprised by the neighborhood when they to the showing, and just keep on driving by anonymously as I wait outside.