Take care of your health and mental acuity and you have decades of future investing to do. 

When dealing with the police, mental services etc the squeeky wheel gets the oil.

I get the "no no" mentality. 

It's important for your mental health that you don't let things like that get under your skin, you run a biz, just like a grocery store will have to toss some expired food, you'll have some losses.

You'll never be able to mitigate & prepare for all issues, but you can manage in a certain way to reduce it to the point where it is profitable financially and not mentally draining. 

The tenant obviously had mental issues and 56 years of age so its very stressful on them understandably.

Buy and Hold is a very different mentality from Buy Low and Sell High. 

https://store.nolo.com/products/every-landlords-tax-deduction-guide-dell.htmlIf you're looking for mental health, how about Buddhist monk (grew up in the UK with a white British accent) Ajahn Brahm. 

The tenant may have a legitimate mental problem that is triggering their behavior, and if they are that volatile you don't want to do anything that causes them to go off the deep end. 

They are -- statute of limitations, -- bankruptcy, -- death, and it's too late to file a claim against his probate estate, -- Seller mental incapacity (and this one is a maybe).Then there are the business reasons not to sue.