PSA- focusing on what your allies did wrong is pointless.
This applies out of game. If your malphite did a bad engage that made you guys lose, what could you do to stop it? If the ADC got caught out? If the top "fed"?
there isn't anything you can do to help them stop being bad or making mistakes, so there is no use worrying about it. In ranked you should focus on what you can improve on, focusing on what someone else can improve on is a waste of time. (unless you are directly teaching them)