Punishing free-riders isn't what I would consider under empathy. I would think that highly dominate people with a lot of testosterone will rather engage in punishing free-riders than empathic people.
I dunno, I hear that oxytocin makes you nicer towards your in-group but less nice towards your out-group.
Previous thread
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.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.