I confronted the guy and he seemed to think he was doing me a favor.

Why are you always so confrontational by the way.

NPNs carry a much higher risk of having confrontational issues with the borrower or situations where the borrower end up in some legal matter that exposes your asset to examination, like bankruptcy.

My guys went out there and confronted them and they were cursing at and threatening my guys while they continued to throw everything out of the truck.

He was confronted on the porch, robbed and then shot in the neck and died. 

When it comes down to it though I would suggest the honest answer when confronted by how much experience you have gained in said industry.Getting new clients is always work but if you are transparent in the way you do business, they will be more likely to refer more business to you.

Should I confront them?

@Tom Cooper his comments were casual and your replies all read as accusatory and confrontational.

I have confronted tenants if police visits are made but not without them.

They are also demanding their rent back because they have left early and I would rather avoid an ugly confrontation in person.