If you're fed, blue is not going to make the difference between you winning or losing in the near future. But for the ADC, it just might give him the xp he needs and allow him to poke enough to make up for his poor performance earlier.
You can ignore that previous statement if you like. Maybe I'm wrong. But whatever the case may be, there is no game, EVER, where you have a justifiable reason to throw the game on purpose. All you're doing is giving yourself a poor excuse to defend yourself with later, in case that play you didn't like cost your team the game.
This is a team game, and giving in to your petty little grievances against your team members will not help you in any way. If you want to win, be a player that's fun to play with, win or lose. If you can do that, then every game is a win, whether the end-game banner says "Victory" or "Defeat".
Playing to win is fine. So is playing to have fun. But with your attitude, you are drastically reducing your chances at either. This would be fine if it affected only you, but it also impacts a minimum of 4 other players in the game. Lashing out at your own team is unfair to everyone involved, including yourself. You can do better than that, and you'll have much more fun if you do. But until you fix your attitude, I suggest you take a break from League; there's no reason to ruin games for hundreds of others just because you can't be mature.