Explain to me as to why it is pointless? You've admitted to being a third party. Beyond the fact that third parties are inherently evil, we need to kill third parties if we want to end the game. Neutrals, such as Shade, are not required to be eliminated and are usually not hostile towards anyone.
That said, considering your claim of pure invincibility and the way that your supposed victory condition works, I have a hard time believing that we can't defeat you. In fact, you being completely invulnerable would mean that your objective can be met quite easily. Take into consideration that the tapes can also kill and we have a good reason to go and figure out as to how we can put you two feet under.