@Jaylyn Heartso I feel that is unprofessional behavior.

No, it is never too late to change your behavior!

In order to select a good tenant the property manager needs two things: Multiple applicants - If you have only one or two applicants, you are stuck.Financial history - Past behaviors are a good indicator of how people will behave in the future.In Las Vegas, the vast majority of tenants renting properties in the $400/Mo. to $800/Mo. range live cash based lives.

I think the most value is in behavioral economics.

You were not under any compulsion to accept their terms.Leaving it on MLS as "Active" after an offer is accepted is a violation of our MLS rules, which state that the status must be updated to "contingent" (CTG) within 24 hours after an offer is accepted, and to "under agreement" (UAG) within 24 hours after the P&S is signed.  

My key point, @Emily Allen is to address the humidity and tenant behavior yourself.  

But do I feel that by not doing it I'm rewarding bad behavior? 

Catch yourself before making frivolous money decisions and adjust your behavior.

Make sure you document everything well - particularly complaints from other people, get a copy of the police report on the gas incident, make a formal record of his behavior and try to get it on film.  

I find his behavior unprofessional and disrespectful, though apparently, not that uncommon.We'll keep looking and again, I thank everyone who has shared their thoughts and opinions.