If it's not overpopulation, what is it? We are encroaching on the land of big game and these creatures are getting used to living along side of us. Since we are so close to wild predators, confrontations are inevitable. The probability of attacks on humans is mostly weighed upon the circumstances that an animal is presented with. I.E. How much/how easy is food to get in the area it's living in? Is the creature defending itself/its young? Is the animal just simply taking advantage of a lucky hunting opportunity?
No one is to blame for attacks, they just happen.