Wally isn't always (but most of the time IS) wrong to refuse to do the work.
I had just finished the safety course for new employees that showed me just how many ways you could kill and get killed on the job by ignoring the common sense: "If it sounds wrong, don't do it until you ask for clairification".
I was tasked to make a software modification to bypass gas flow, pressure and temperature limits for a piece of semiconductor process gear that could result in potential explosive results according to the company's process documentation.
Pointing out the conflicting document and the engineering change request, I asked for clarification UP the chain of command. That only brought pressure to "comply" from marketing and dept heads. Asking for an exemption sign-off signature from the safety group and having them refuse resulted in a stalemate and the project died. Didn't make any friends in high places.