Meh. Personally, I like Coy. She's one of the more active admins. Really, giving someone a short ban for an accidental TK isn't even something I would necessarily oppose if it was bad enough. I've certainly done this with my archer as well: tracking a horse, guessing about how much I need to lead it by, turning, firing, oops, right into a teammate's head. He didn't move into my shot, I just was zoomed in tracking the horse and didn't realize someone would end up being in the way as I did a quick snapshot.
I think there are cases where people would agree with banning a player for "overly incompetent play", basically as a way of saying "That was so bad, I think you should go sit down and think about how not to be so reckless in the future".
It's dicey because it's a judgement call. We certainly don't want every accidental TK to result in a 1 hour ban. But I know if I had spawned in, was sitting there adjusting my spawn equipment or something and suddenly got an arrow in the back of my head from a teammate while not moving, I would probably be hoping to see that person get a short ban.