The seller did not want to pay for remediation so I threatened to walk away.

I say this as a insider whom as a brokerage we tried to blow some whistles and work within intelligent reason and our brokerage was threatened at loss of our license if we did not meet the quotas as determined by gov., the threat was "financial discrimination".     

But your point is spot on that animals usually bite when they feel threatened.

@Bill Plymouth Hi Bill, most of the time it's agents who are so uppity about it because they don't understand the concept or the specifics, or are simply threatened by market competition.1.

Although I knew this was bogus, the local pd did nothing to help except threaten me with arrest and told me that it was a civil matter.

Being threatened with a mechanical lien for work I never had a written contract for, an estimate or anything.

It felt like every other month I was on the hook for a new major repair, a tenant was threatening to move out because of some problem, and I still had a huge mortgage to contend with.

If someone here posts about how they run their business without a license and then threatens to sue people for bringing that same information to the relevant regulators - what value are they adding to the BP community?    

The biggest reason I was reluctant to bring in a pro to take the pictures was that the city's been threatening to build a new park for several years and how that would change what the pictures of what the view would look like. 

In addition, you COULD still try and bluff by threatening eviction papers and even providing them; It's up to your tenant to find out if you're technically (somehow) in the wrong, but it may be the push you need to get him to cooperate.