I homeschool, too, and bullying and the way schools as institutions don't deal with it are two reasons.
I have to disagree that young children don't display empathy. My almost 7yo has expressed empathy since he was very young. He has always perked up and been affected by a crying baby or child. He wants to make sure the child is ok. He starts discussions about what he perceives as unfairness or injustice or bullying. I think kids who are never treated with empathy won't understand it. A simple example is the very common way that I see most parents deal with their young child's hurts and upsets. They tell their children it's no big deal and to just brush it off. They tell their children they aren't really hurt.
I do agree that we are all born with an innate desire to have power over ourselves and our own lives. The instinct to control our own destinies is not the same as the behavior that we use in order to achieve that. I lean more toward the idea that the behavior, to a large extent, is learned.
John Lennon was in entertainment news a few days ago. I guess it was his birthday. I'm not really sure because I'm not what you'd call a fan (I don't worship any other person) and I didn't pay that much attention to the news. I did catch a few snippets here and there. One thing that stuck in my head was a quote from him. I'm not going to get it exactly right. It was something like, "If everyone would demand peace instead of a bigger TV, there would be peace." Beyond basic necessities, we learn that having more is better.