The snipers have a range at which they can attack at, moving them out of the players reach might move the snipers out of their available attack range. They also probably didn't think people would want to cheat, apparently giving too much benefit to the doubt. Why play the game if you don't want to play the game kind of thing. It's like cheating on a test. Why put all the people in the sane room. Couldn't someone just look over at someone else's paper for the answer? Why not search everyone down before entering to make sure they don't have a cheat sheet or something? Same principle but a different application.