Ah, but the question is "is valuing all lives regardless of species ethically immature?"
Lots of reasonable points could be made to counter that opinion.
And it's not that they value all lives equally, it's that they value dogs over humans.
but the same five year old who is picking the 10 dogs over the 1 human is also grabbing their toy from their little sister and bopping her on the head with it and making her cry, so i am not trying to defend some notion of a developed sense of toddler morality.