Is Diavolo really evil?

I've been pondering over the character of Diavolo from the popular manga and anime series, JoJo's Bizarre Adventure. On the surface, he seems to embody all the traits of a ruthless villain, with his cunning schemes and cold-blooded demeanor. But is he truly evil, or is there more to his character than meets the eye? After all, even the most villainous of characters often have a backstory that sheds light on their motivations and actions. So, I must ask, is Diavolo really evil, or is there something deeper at play beneath his sinister facade?