Maybe send them out a curtesy notification about the charge and explain that, that's the policy.Want to change the behavior? 

Art,I work in healthcare and I've studied a lot about behavioral health.  

The combination of incomplete and unnormalized data, unpredictable human behaviors, and the necessity to make assumptions based on insufficient information makes accurate predictions challenging.

1) Definitely check local codes first2) Steel is silly cheap right now, and resists "tenant and neighbor behavior" quite well3) Consider a more substantial fence on property perimeter, such as block, and then more inexpensive options for interior yards.4) I doubt you'll get more rent, but you will have more interest, especially if other options around you aren't fenced.  

And until that is solved, I will be using my extremely limited powers to battle that human behavior.

However, the renter does have to follow basic rules regarding noise, cleaning up, no aggressive behavior, no property damage, etc.3.

As you said it correctly, the point is not about taking the guests money but that the guests' behavior is very different for the majority of them if they have some money hold on the side that the HOST CONTROLS ON HIS OWN DISCRETION.

I have experienced ridiculously sh—- behavior from Guests including booking for 7 days then wanting to shorten the reservation to 1 day the day before and reviewing us as though they paid for a hotel not Airbnb.  

I hope that she is ok.I promise that all of the above is true.Family first …then morality and integrity… Ps ethics take a back seat but The diff between moral behavior and ethical behavior?

If you increase your finances through real estate without changing your personal behavior you will only amplify your problems.Work on yourself first, there are plenty of books and online resources.