Point being?
evil for good...
Saul and the Amalekites is a tough story to figure out. I’ve read one claim that centuries later, a descendant was Haman who tried to exterminate the Jews in the book of Esther.
It is only our faith in God that tells us the extermination of the Amalekites including women and babies would be justice. There’s nothing obvious in the story that says so.