R-E-S-P-O-N-S-I-B-I-L-I-T-Y

Well, in the case of the man being stabbed in Portland, I believe it was partly everybody's fault. If it is true that the victim started the fight, then yes, it is partly his fault, because that seems that he wanted the stabber to fight back. It is also at fault of the people who didn't call 911, because, come on, there's a person dying on the sidewalk! That sure makes it seem like they don't care whether or not a life is gone right in front of them. If some one had called, it could have saved him. So yes, it is their fault as well.
I don't think it'd be "God" or "The Devil's" fault. Well, because I don't believe in that. But if I did...actually, I don't think I'll get into that.

A person should be responsible for their own actions if they're a minor, but older than about 9 or 10. But if it's dealing with insanity, or under the influence, they shouldn't, depending on the situation and circumstances.