Wild One - to answer your question to me, I would not blame anyone. My opinion is among those suggested by you -- that it is an unfortunate incident not requiring blame that folks should learn from.
Incidentally, I noted in today's Salt Lake Tribune an article about folks camping at the same campground and in the vicinity of this campground in the past couple of days since this bear incident. One lady had her two Yorkie terriers standing guard and an aluminum bat to protect from any more bears in the area -- both ineffective safeguards in bear country, if anything those yorkies will encourage a bear encounter.
I also read about another campground near Payson being closed because of a bear in the area.