"It's tragic that in ignorance there truly is bliss; we can never cherish it while we have it, but we still mourn it's passing when we lose it."

Throwing a rock to protect your food is humanity at it's most fundamental level. It's the reason we were able to develop as a species. When you're reduced to that point, you do not have the luxury of extending your morality to the things that threaten you and yours. I'm sorry you have to confront this today, but this is the reality of life for most people in the world. It's despicable by your standards, but your standards have gone generations without facing extreme hardship. I sincerely hope you never have more experience with the subject than discussing it online.