I dont get it how Riot bans a player because another kid Draven decides to take all the kills

Please explain me why i got banned because i wanted the game to be lost because one Draven decides to go Top on my lane and steal all mi kills. At this point we had a Mid laner,a Jungler and 2 adc and 2 supp one of wich was a kid Draven playing adc top with me Darius supp. Now please Riot explain me why i got banned for 14 days. This is my first game in which i troll and not because for no reason. People want to ruin my game when i play just for fun taking all my kills. So Riot what do you expect me to do,play Darius as second supp on top lane?? Thank you for the 14 day ban and giving that 9y old Draven a good game. Thank you!