I see nothing wrong as long as you target ALL admins not just one or two specifically.
Hey admins, why don't we take a list of all those here and target them with snipers! Fight fire with fire! :-P
There should be some limitation to this though.
What happens if one admin is on with several people from this list?
They could literally be knifed every single round by a non-stop chain of people from this list getting traitor.
Sure there is no "real" way of stopping it, but the out of respect guys if an admin is no longer having fun with the game, please don't continue to target them.
There's a difference between having some fun with other members of the community and being a dick.