Sounds like unlawful behavior for profit to me.

You're best determination will be to actually see the areas and observe behaviors.

Let them both know that any behavior that is directed at another tenant that is meant to alarm, torment, terrorize - including name calling - is considered harassment under the law and would be a lease violation that could result in their eviction.  

I've built the system that powers the Tribeca Film Festival, I've worked for various well known startups and I'm the cofounder of an online behavioral health startup, iCouch.

My tenants pay every month, but I've received 3 phone calls about their behavior from the park owner since the beginning.

Hard to say you "changed your mind" when your behavior doesn't change isn't it :)Be bold Be thorough and use your professionals and their accumulated wisdom.  

SO you are taking the wrong conclusion that the behavior of people clicking on your ads look and feel like those in desperate need to sell.Your data does NOT represent motivated sellers.

I moved out of the unit in January as I found someone to rent and in the first month of the new tenant living there they too filed a complaint against the below tenant as they heard verbally abusive behavior as well.

I cross reference between them to make sure it makes sense.If I see any issue I ask the applicant and if they are responsive and honest with their answers then there is more chances I will accept them then someone that is not honest with their answers or take to long to respond.I test both financial stability of the applicants and their behavior and attitude.

Wow - bummer.I'm very glad that this type of behavior isn't prevalent in our area.I guess the only real solution is to visit the properties on a more regular basis.Good luck to you.