Losers are People Too
There are summoners who enact behavioral scenes which bring about loss. They don't want to become aware, be shown the way to winning, or claim superiority. It's not quite On Purpose, because the conscious mind would vehemently deny any such notion, but nevertheless their actions tell the story.
Every match has a winning side and a losing side, and some prefer to make decisions about the side they end up on, a substantial part of the heart and soul of combat.
I use my block-list as a tool to help me dodge games that contain potential team-mates that I've flagged as preferring to be on the other team. https://s6.postimg.org/iofh88l3l/bloodthirster.jpg