If you could see how you ONLY do things to yourself, it would be so obvious you are the cause that you would have absolutely no NEED to even begin to go looking for its source. You wouldn't even need to find out who else is responsible for this. And so you wouldn't even start to step onto the slippery slope of blaming other people for it.
It's solely because you do not SEE, that you did this to yourself, or you chose it, and therefore your vision is obscured, and so you quite literally are now INCAPABLE of seeing who really is responsible.
But you will try TRY to find out who is responsible, you'll search around the room angrily trying to point fingers of accusation and judgement. "Was it you? or You?!"... And beyond even asking if it was someone, which you strongly believe it MUST be because you didn't see yourself do it, you pretty much have found others guilty automatically.
Then you think that if you FIND or have found someone guilty, and can blame them, that you're simply being justified. You're simply pointing out what the cause is. You're just honestly and innocently identifying who is responsible. You think you're just doing the normal honest sane rational thing of finding out who caused you to be upset, and that you're just pointing it out. You don't realize you're totally barking up the wrong tree because the cause isn't out there.
So projection, blame, anger, judgement, scapegoating, it's all simply an effort to continue to recognize who is responsible, but at the same time as being irresponsible yourself. By not being responsible for who you are, you entered into darkness, could not see what you were doing, and now are attempting to find another person to pin it on. And you will be wrong.
You will ALWAYS be mistaken if you EVER decide that it's someone else's fault. Because it is ALWAYS YOU that is doing it to yourself. You don't need to find someone to pin it on. You need to wake the fuck up and SEE CLEARLY, so you can recognize that you only do stuff to yourself.