Moral Event Horizon: Arguably, killing a random woman because she was in the way was this for Broadsky. Killing serial killers made him vaguely sympathetic, in a Max Keenan sort of way, but this seemed to cross the line. Of course, Caroline disagrees:
Caroline: Man sneaks into [Booth's] house, threatens [Booth] with a gun. That's unforgivable. He should be lethally injected just for that.
- Sweets allowing Brennan to think Booth is dead for 2 weeks for reasons that basically amount to For Science! is considered to be an unforgivable act by much of the fanbase, to the point of turning Sweets into The Scrappy for many.
- Epps' various murders and sick games are bad enough, but when he saws his wife's head off while she's ALIVE, it's pretty clear how evil he is.
- Not to mention sending her heart to Angela (after reading that she was called the "Heart of the Operations" by Hodgins) and booby trapping the head of his wife with a glass capsule containing a highly poisonous powder, which almost killed Cam.