Why is it so hard for bad players to take responsibility of their rank
All you see are bullshit rants on bad teammates when anybody whos taken a probability 101 course knows that after about a hundred games your rank accurately predicts your skill level within a few games margin. Not to mention platinum players play like intermediate bots when it comes to macro, theres no excuse to not win the majority of your games to climb.
Having bad teammates? well the probability that the enemy team has more bad players is higher unless you ARE the bad player. So objectively speaking the people who complain about bad teammates are bad themselves.