The Blame Game is played with such fervour by them because otherwise it would be them centre stage in the Shame Game, and they cannot take it.
Remember when he does this he is QUACKING. It is all he can do, put it on to others as he is incapable of seeing, believing or speaking the truth.
Think of him as a duck.
If a duck waddled up and started quacking at you, would you keep listening, or worse try to understand it? NO?
OK, next time he starts quacking, imagine him as a whacky, quacky duck.
Try not to end up rolling on the floor laughing, and just let his cr*p go past you.
God bless