Well, in most cases we offer warnings for violations before banning unless their are prior violations, such as has happened here. If you'd received as many unpleasant threatening cease-and-desist letters as the Owner has, you'd probably insist on a very cautious policy too, especially when it comes to subjective yet risky material.
Just err on the side of caution like we do and you'll be fine. If you're still not sure, feel free to PM any mod and ask for a 2nd opinion before you post.