Just the threat may make the seller reconsider trying to make a few extra bucks. 

Tenant A then calls me and sends a video in which the other tenant’s husband is making threats and calling her vulgar names.

It gave me the piece of what makes a successful person that I had been missing: dedication.Since then I'd been teaching myself coding and cyber security, working towards earning certifications.

If your trying to buy an old apt complex in the area full of 1/1s then that’ll be def more headache and potential war zone threat. 

They needed the big bad landlord authority figure to come in and tell them both to behave like adults or they would be out, and to make them both believe that would be a terrible long-term outcome with bad knock-on consequences.The banging on the doors, the cursing, in PA that would be assault and terroristic threats.

Mold is a microorganism which can multiply and spread very fast and presents a healthcare threat to at least 20% of the people in the US.

Without making any threats or ultimatums, you may be able to get her to understand that her continued tenancy may depend on how well her kids behave, then actually do something about it.

As long as it meet your requirements and cash flow I do not see why $150 is a threat.

Buy with that in mind and protect yourself Also, our brains have a built in greater fear of losing something, It's always the threat or news of possible loss that takes us down the rabbit hole. 

If a seller is being a real jerk about something they were obviously hiding, sometimes the threat of a court action can make them change their minds quickly.