What if heads that aren't cooler prevail? Namely, half the heads there? One of them tried his hardest to be part of two slaughters, and the other? I've still no idea what was going on with the locking-up of elves and yelling.

If we tell them, we're offering them input on him. Even if we don't actually offer that, they'll feel like they have it. And then if we start trying to explain why attacking him is not a good idea we start to deal with other secrets. It feels like we're seeking to knock a hole in the foundation of a wall.