Didn't WWE promote and then have a live sex celebration in their ring a couple years back?
Besides, they use bob wired wraped 2 x 4's, slam each other on thumb tacks, light tables on fire, list goes on. It fits Joe's new character and this Nation of violence thing. You can't be a one man Nation of Violence and scare people with a very sharp pencil or a chair or scissors. And if he used something like a sledgehammer, then everyone would say he ripped of Triple H.
If anything, the thing that didn't make since was that he pulled the knife on Steiner's throat, WHILE the cops were there and they were only worried about Styles. Throw in the fact that he was impersonating a cop and they did nothing about that either, made it not make since.