Just a couple comments.. I wasn't physically threatened, but I was held without my consent by virtue of the landowner blocking my car with his. I have little doubt he is who he said he is (owner of the adjacent land), and in that respect simply looking out for community property. I have no idea if the cemetery is private or not, but I didn't see any signs either way.
The cache is in a nice area and fairly easy to find. I personally don't think it should be archived, but I do think people need to know that there is a chance they may be challenged. That was the reason I logged what I did. It could be very scary for some (I'm too old & dumb to scare easy).
Anyway, the landowner admitted he has no say over what other people do for fun, he just doesn't happen to like geocaching - but I bet he'd talk about old cars.<g>
As for e-mailing the cache owner, doesn't he get copies of all logs?