Every party needs one, just to keep the party moving. When the entire party is busy hemming and hawing about how to best approach an encounter, they often need a Leroy Jenkins to just axe-chop the door apart and start taking heads.

The real issue is that oftentimes, the heads belonged to the hostages that the party was there to rescue. If the awful little creature had actually paid attention at all, they would have known that. But they were grabbing their fifth beer when that part was explained, (and they wouldn’t have listened to it anyways), so they had no idea who was inside the room.