Why in the world should i lose LP??

Champ select starts with these two (3rd and 5th pic respectively) saying "smurfing duo with...." "only play adc and jungle" well im sorry but im a jungle main and i have 2nd pick, if youre really a smurf then you should probably be able to play all the lanes good enough for this elo (silver4) at least. so the first pick takes adc and i take jungle. one of the "smurfs" takes adc and the other takes idk what lane, but just to troll. They spend the rest of the game running around the rift picking fights with an enemy that has out leveled them, has more items and is in a larger group. needless to say, welcome to LoL, where trolls reign supreme. and i tried with some help from a struggling . I knew we were going to lose, but its not like i wasnt going to try. I pushed lanes as much as i could, found kills and really just tried my hardest. those two "smurfs" fed first and second blood (then a continuous stream of kills after) then left around the 8min mark. in total i think they had like 9 deaths they just handed over.

Pretty much all im trying to get at is, WHY SHOULD I GET MY LP TAKEN AWAY WHEN I WENT 6-6-8 IN THAT GAME. IF THERE WAS EVER A SITUATION TO GEGT A LOSS PREVENTED, IT WAS RIGHT THERE.

Look, i know im not the best player, so keeping LP is huge for me cause i may go on streaks where i watch it fall away because of my bad play. I also know its hard to know when a team just played bad or was trolling (kinda). but seriously, 9 deaths then both left and i cant even keep the little LP i have?

Rito pls