This and teleporting players back and then attempting to set them straight can be a long process. It would probably mean the admin would have to go AFK handle the situation and then rejoin the game. Having to go AFK then rejoin as an admin can also affect the game play even more than the rusher originally did. If the player is rushing its easier to kick/ban, continue with the game, and deal with the unban later on the forums. This way it has the least negative impact on the game.