[RobRoy]

I've enver heard of an enraged bear killing another bear's children to get revenge against the zoo keeper.

That's because bears aren't as smart as humans. Humans have a far greater capacity for both good and evil than any animal.

[flyervet]

Exactly. Bears attack the one causing their pain. This indivdual struck out blindly at his own child and someone else's children, then killed himself. Unless you believe these children were causing his pain, you must admit that what this man did was every bit as evil and almost as random as any other mass murderer.