This druid was being extremely obnoxious during Vale LFR, with namecalling and complaining when our tank rightfully complained about the DPS (we wiped on Sha, even, around 20%, because people were not DPSing hard enough). So during Sha trash, I dispelled him with 5 stacks on him. Never were the words "[druid name] has died" so pleasing.
You might say that I was a shitty healer for intentionally killing another group member, but after he insulted me in Turkish (something about a smelly dude), I felt like I had to do it. and it was only trash, so it doesn't really matter in the end. We wiped once on Sha because of DPS, and during the second attempt (and the first as well), I lifegripped some players so Gift gives the DPS buff, enabling the kill, so I feel like i contributed to the kill.
remember kids, don't insult your healer!
Have you killed other players intentionally as a healer?