A losing game-blaming others? blame yourself

So in those low-medium elo game, after a losing game, people starts to blame. For example, in one of the games, I was the adc Vayne, who had won the lane with not so manys kills but some assists. We have a karma support who does tons of damage. Rengar Jungle, Lee top and Yasuo mid. We had great advantages in the beginining but we still lose the game. We never team fight. Everyone was doing their own thing. I m always the one with support. In one the fights, when the rengar dive a 1v2 with no vision of the rest of the enemy team, in fact all 5 are all near. Then Rengar dies, and we are left with my support and top laner Lee. Our yasuo was soloing baron. All the fights are like this, so I have no chance to deliever any damage without getting myself killed. In the end, I have the least amount of damage. I do feel that I could do more damage but I think that EVERYONE has a part to blame on a losing game such as this one. If we team fight, I have peels and protection, we can win. I just want to say I think that if you lose the game, then it is YOUR fault, not any others. There are things you could do to win. Especially a team with good early game. What do you guys think? I think is unfair to point out the lowest damage player and blaming him for the lost. Everyone takes part in the lost. In my case, the rest of the team just doing their own things, leaving my support and I to 2v5 under turret, it is unfair to just blame the ADC. What do you guys think?