I sometimes think of actors who make movies attacking each other are risking and paying heavily acting out such attacks. Geroge Sanders acted out being snobbish and bored. He looked down on others and was the very essence of boredom. He committed suicide at 65 saying so in a note he left behind. He wrote a bio book about himself with a title that said he was a dreadful man. He acted all his films that way and so he was.
Jesus is talking in Mark 11:23-25 telling me to forgive others so that I can be forgiven myself. Attacking others, or even just being annoyed by someone since it too is a sign of weakness, is an attack on myself.