Maybe the aversion has something to do with the fact that most creatures in nature live under constant stress and can't get enough to eat. Common people like stories of redemption and overcoming adversity, not constant struggle and short tragic lives.

Also, kindercide is a fairly common thing in certain primate communities. Humans in general probably don't have the stomach to be reminded that they have anything in common with a similar species where dominant females kill the children of rivals.

Plus, there are a fair number of competent periodicals on offer, like NatGeo, which do a decent job of promoting the natural world.