Non-Babyeating is also just a lot more aesthetic in certain ways, at least for me and probably many others. There's the rich history and culture associated with non-babyeating.

I think you are misusing the example. The lesson of three worlds collide wasn't that Babyeaters should obviously stop eating babies, it was that different beings have different and potentially mutually incompatible values. Why in the world would Baby-eaters want or work towards changing away from finding Baby-eating aesthetically pleasing?

Edit: I don't really understand all the down votes, can someone explain to me why I'm wrong or why the post isn't constructive? :)