In retrospect, reading this thread is hilarious to me since I have been so inactive a user as to not have built up a model of any of the users who have been active since late 2011. You could argue that I have a poor or no theory of mind, but it is still fun attempting to construct temporary models for everyone based solely on the contents of this thread (I have no time to read the previous five years backlog).
Personally I think that there should be a lower limit of lesswrong culture/rationality in each post regardless of it's niceness content, and have a preference towards nicer posts, though (and this next sentence will turn a lot of people against me) making the forum too accessible will encourage Endless September effects worse than what the community on this site is currently buckling under.
It doesn't have to be a trade-off between rationality and politeness. Maybe we could downvote both comments that are stupid and comments that are rude. (Polite but not smart comments could be ignored, and only insightful non-rude comments upvoted.)
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.