Can rationality be lost?
Sure, when formerly rational people declare some topic of limits to rationality because they don't like the conclusions that are coming out. Of course, since all truths are entangled that means you have to invent other lies to protect the ones you've already made. Ultimately you have to lie about the process of arriving at truth itself, which is how we get to things like feminist anti-epistomology.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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.