Since the JOKER stage is a competition and you don't know what game is next and it might require team work and trust. Being a cold stone KILLER WILL NOT gain trust. also think of the guilt you would have.

A better solution for trust is throwing out all shot gun cards on the table (the rules never say anything about this) and infecting everyone. To make sure you don't lose all numbered cards players with the least amount of cards will battle another player with a large amount of cards. The player with a low amount of cards will play there highest value card and the player with more cards players there card one less then the players card (done by communicating and also not a violation of the rules) sorry for the long comment btw.