Also: technically speaking, when you don't have enough information to really know who is at fault, the correct way to proceed would be to not make any guesses. In practice, however, I think the human brain is wired in such a way that it usually has to take some kind of guess.
When you're very frustrated about something and its not very clear what's causing the problem, do you think you're more likely to conclude, "there must be something wrong with me" or "there must be something wrong with somebody else"?
When you resort to violence (and don't tell me you never have - I am counting throwing a stuffed teddy bear across the room at your big sister when you were three years old as an act of violence), is your worst violence usually directed at yourself or at others?
How satisfied are you with your current balance of blaming yourself versus blaming others? (1 = I want to drastically change my current balance; 10 = I want to keep my current balance exactly the way it is. Note: The degree to which your balance is expressed through physical violence is not at issue here, just the degree to which you mentally place blame in one direction or another.)
How do you think that your own violence levels compare to the "average" degree of violence that others in your society/nation express? (1 = Only 10% of my society is as nonviolent as me; 5 = My violence levels are absolutely average for my society; 10 = only 10% of my society is as violent as me. Note: YES, violence perpetrated exclusively against yourself does count just as much here as violence perpetrated against others.)