my rank is barely decided by my skill, but by the amount of feeders/leavers etc. in my team

Even in high platinum stage, where players should be experienced enough to not do basic mistakes and players who tend to have bad behavior like leaving or feeding on purpose should not have the honour to play, my success is barely decided by my skill, but by the first two. Just lost another plat II promo....one of many, i lost the count already. A game where our adc decided to stray from the team entire game and push solo until he gets killed in enemy territory, because by his words the support was not playing according his bidding. The remaining players of my team constantly engaged in 1v3 or even 4 enemies and did other basic mistakes like hard baiting on a tank. I was fairly ahead, as well as our mid laner. I was feeling we have the better chance to win, no matter the bad moves they did but they just kept making bad moves and throwing in a stream. All i could do was to repair the mistakes as much as i can and spectate this fiasco. I wouldnt mind it, if such games was once in a while, but its not. Its unbelievable that at this stage of ranked this is extremely common. Ive been going between plat IV and II over 10 times prolly in the matter of 50-100 games. For having the experience they do to reach thus far, they should atleast lay back a bit and let the obviously better players carry them, instead of keep dying without purpose.Id say the overhelming majority of the games is decided by feeders and leavers and by the match making which is unable to fit balanced teams. I refuse to believe i can be decked with such players and share the same rank. EDIT: to actually shift my post of simply being plane words here is my stats for my last losses: 8/4/6; 10/3/10; 4/5/2; 5/8/10; 8/8/9; 18/10/13; 19/5/6; 4/7/8; For the last 8 lost games, i had positive to great performance under the circumstances of being matched with terrible players. I can partly blame myself in the 4/5/2 game for playing Twitch, which is so reliant on his team and can hardy stand out if they do so bad. Among my team there were 0/9/6, 1/10/8, 6/9/4. The 4/7/8 game i had the misfortune to get 1 of my good picks banned and another picked(both of whom are low pick/ban rate so its really a very rare sight) so i can fully blame myself there. I main Eve and over 80% of my last hundred or so games are with her. With an average kda of 9/6/11 i have 49% win rate....According this, to get out of plat, id prolly need to be 20/0 every game