One would think that blaming the self would be a bad thing to do. However, I can think of a situation where you can see its benefits.
Imagine a father returning home on a Saturday morning with a brand-new car and parking in the driveway. He goes into the house and asks his wife and son and daughter to come out and look at the car. As they are doing so, he walks up to the son and punches him right in the face knocking the son down. At this point the son would be suffering both the physical experience of being punched, and the pain of falling down, but also the hurt feelings of being harmed and treated insensibly by his father who he hoped would treat him caringly.
Now imagine the same security situation only slightly varied. In this case the son comes out to see the car with his sister and mother but at that moment he takes a key from his pocket and scratches the car from the front all the way to the rear damaging its surface and appearance. Now, when the father punches him, and he falls down and has the pain in his face from the punch, and is hurt from the fall to the physical ground, he has less hurt emotionally from the father’s mistreatment. Can you see that by deciding that he caused the problem, or created the bad treatment, or blames himself somehow for dad’s punch, he actually reduces his feelings that are hurt.
Thus, sometimes people accept blame and feel like they did something wrong not because it’s true, but because it actually can reduce inside them the feelings of hurt from the mistreatment, neglect, or abuse from others they hoped would care.