If a bad situation must be the fault of someone else, we're other-blaming. If you failed an exam and you're blaming the teacher, you're directing your energy to the wrong place. Someone cut you off on the highway? If you honk your horn, flip them off, and stew, how is that helping? Now you're cut off and mad!
This doesn't mean you have to blame yourself for every negative situation. You don't have to blame anyone. No one has to be at fault if you let the situation pass without attaching blame.
That jerk is taking too long in line and I'm going to be late!