And the chimp’s owner has no idea of what provoked aggressive behavior from her longtime pet? (2/17, A-5, “Celebrity chimp rampages; Former star of TV commercials is shot dead after violently attacking visitor, police”) It’s because he wasn’t human!
Even though he was treated as human for 14 years, he was still a wild animal. And when a wild animal is deprived of its own kind for years, it’s going to go bonkers eventually. We should not be treating our fellow creatures this way.