Perhaps “living creatures” is a bit broad if taken too literally, but in context here it seems like the implied topic is clearly animals. One reason the base assumption is caring is because we have laws against harming, torturing or being cruel to animals, and laws against killing some animals. Another reason to care is the growing scientific and public awareness that animals have intelligence, consciousness, and feelings. A third reason is that we have a base assumption about caring for humans, both socially and physiologically, and seeking a moral consistency might automatically lead to the reasonable question “shouldn’t we care about animals too?”.

Since your question implies some, are there reasons that we shouldn’t care about animals or other living creatures?