I don't think it's a good idea to add a "self-unalive" taunt with an actual weapon. Now people will argue and say that Soldier has a taunt where he blows himself up, but he uses a hand grenade, something a typical person (or player) probably won't own, at least not a live one. A revolver is a WHOLE other story.

I understand that TF2 is an extremely bloody and gorey game, but this game is designed to be silly, at least to an extent. I feel like Soldier's taunt is just goofy, as he's using a grenade to take out enemies AND himself in the process. This just feels inappropriate and conflicts with the theme present in TF2.