Hello there! Hmm y'know how you like eating ice cream on a sunny hot summer day? That's how people like hurting others it's not like they wanna make the world a worse place (although they do) but their brain is wired in a way that they get pleasure when hurting other people, each person has their own pleasures I for example like playing some video games at the end of the weekend while drinking a beer some people gonna like other things and so on everyone is different I suppose.