You should pursue damages for that behavior.

I think all of us should always be wary of unscrupulous behavior in our industry.

So the point being the term may merge with your niche or strategy.Today, I focus more on the landlord tenant relationship and getting good people (superb payment and little or no problem behaviors) and the exact term seems to take care of itself.

1. walk through inspection with them present to compare to move-in inspection and noticr of non-complaint behavior if any .

There's no way to know ahead of time if this will encourage bad behavior, it could. 

I would also like to evict him from my building for this behavior, but fear that will only increase the threats/violence as soon as he gets notice of this.If I file for a protective order from this tenant, what becomes of him and his lease?

You'll want the owner present to manage tenant behavior.

What is the behavior of the other agents in that office (work from home, in the office)? 

There is no excuse for that type of behavior, especially over something minor such as changing locks.That being said, I don't understand what you expected to accomplish with the walkthrough given the facts you laid out.  

If that dog had tendencies of poor behavior it would not have been accepted as a police dog and 2. they darn sure don't go inside of any building, they are better trained beyond house broken.