Blaming other people is always wrong, because no one knows what has happened and happens in the soul of another person.
We often make judgments about other people. We call one person kind, the other stupid, the third evil, the fourth clever. But we should not do so. A man changes constantly; he flows like a river, and every new day he differs from what he was before. He was stupid and became clever; he was evil and became kind at heart; and so on. You cannot judge another person. The moment you blame him, he becomes someone different.
If you want to correct your failings, you do not have the time to waste in blaming other people.
Never blame your neighbor until you have been in his place.
— The Talmud
Forgive other people for many things, but do not forgive yourself anything.
— Publicius Syrus
I know of myself that I do not wish to do evil. If I do evil, it is because I cannot restrain myself. It is the same with other people: they usually do evil because they cannot restrain themselves from evil. Therefore, why do I think badly of other people? Why should I blame them?