Why play if you just wanna int and rage quits?

I mean what is the point of wasting other people's time if you just wanna intentionally feeding then rage quit? Or if team doesnt want to surrender, you just rage then left the game? If it's connection issue that you left abit then reconnect is understandable but not when things doesnt goes your way, you just rage quits in the middle of the game. Last night met this so-called 'TSM' ahri in a normal match, he said he is from TSM but intentionally feeding mid lane then not even reach mid game, he said he go match coming up and left? Pretty sure he is lying anyway.