Every couple of games there's undoubtedly an inexperienced player who realizes they will not win a game, so they attempt to disrupt as many other people's strategy to win as they can.
They'll often make mistakes early on in the game and, as a result, go on a kamikaze attack killing off all of their own troops in an attempt to just be as disruptive as possible to everyone else. Once they've killed all their troops, they leave the game prematurely.
Players who do this should be banned for such conduct because it removes any level of skill or strategy from the other players in the game. It's poor sportsmanship and makes the game unpleasant to play for everyone else
Kurtharris21