I want to suggest adding the following:
Do not provoke: IfIf your post (especially comments) can be interpreted by reasonable people as having an intent of provoking negative response from other member(s) of the community then it is not welcome here. If you can not post it a way that is not likely to be taken as provocative then do not post it.
I think most of the behavior we are wanting to curtail happens in comments and are the result of comments that would fit in here. TheseThese comments are in general not constructive or productive anyway and even though often they have a legitimate concern they often seem intentionally phrased in a way that is intended to provoke rather than to help or clarify.