How on EARTH do people have such a lack of forethought and hindsight?

Just got out of a game where a Rengar and Lissandra would get a kill then push hard and die to a gank. My whole team then would constantly compare me to the enemy ADC who was getting free kills from deep pushers... at the time of them pointing out my "low CS" the enemy adc only had 5 more than I did...

Like do they care our Rengar and Liss are feeding? As long as you have high kills then your deaths dont matter? Can we make "Gold value you were to enemy team" a stat? They barely even joined Teamfights. Yet its all MY fault?? How on earth do people see whats happening in front of them and then go "Nah its because THIS player is shit is the reason we're losing, not the ones continuously dieing for full gold"