I understand how you feel about that. The problem is that once an animal like this learns to harm or kill a human, it becomes much more dangerous. That is why animals that attack humans, even kill humans are destroyed because they then learn they can overcome a human being and know the taste and smell of human blood. Once that takes place that is something never forgotten which makes an animal like this even more dangerous. That is why it is so important that human beings make sure they are not in a position for this situation to take place, we have to be the ones that "think" and "prevent".