Spiritual practice . . . involves, on the one hand, acting out of concern for others' well-being. On the other, it entails transforming ourselves so that we become more readily disposed to do so.
If the basic human nature was aggressive, we would have been born with animal claws & huge teeth -- but ours are very short, very pretty, very weak! That means we are not well equipped to be aggressive beings. Even the size of our mouth is very small. So I think the basic nature of human beings should be gentle.