"Hundreds of visitors watched in horror as the woman, who is thought to be mentally disturbed, scaled a fence, a wall and a line of hedges to get into the enclosure as the animals were being fed..."
Zookeepers rescue woman from polar bear mauling -- Times Online UK
Polar Bear attack! on Weekend Sunrise
"Natural selection acts on the phenotype, or the observable characteristics of an organism, such that individuals with favorable phenotypes are more likely to survive and reproduce than those with less favorable phenotypes." -- Wikipedia
Are you serious? How did this happen? I know they did the right thing but sometimes you got to let the crazy ones go. I don't blame the zoo or the bears.