It might be more simple than we imagine. We learn to love from those who love us…without that initial dose of life vaccine I think it is hard to expand our horizons to include other species. Children come full of light, and the desire to love…but that yearning must be mirrored.
I learned to love the natural world from my parents…and from being exposed to it. Growing up on a farm helps…venturing into the wild helps…though I suspect if you grow up with people who only care for money, status and power…that early potential to love gets twisted into consumption.