I would argue that the point of Lord of the Flies is that savagery is how people naturally act when taken outside society.

The fact that it's natural means nothing. It's natural for small groups of humans to make war on their neighbors, to kill their men, rape their women, and enslave their children. But we don't put up with that kind of thing now, for the most part.

I agree with your last sentence, but my question is: why aren't they working hard to prevent it? Of course children have to learn this stuff, it's clearly not innate, but if they're going through their school years being bullied then clearly they're not learning the lesson.