I am conscious and my experience of the physical world including my own body allows me to grow and feel.

At a bare minimum you should care if for no other reason than self preservation. You probably seek fulfilment of your need for connection in that others care about your existence. You’re much more likely to receive that if you care for the existence of others. Furthermore, the experience of caring for others enriches your own sense of well being and value of self.

I didn’t use “good” because its meaning hinges on context and the morality of the reader.