What kind of people are these, and how do you handle it?

These type of people are general known as 'Sadists', the opposite of 'Masochists'. They find pleasure on paining others, and they enjoy when others suffer. It is a type of mental disorder, and psychological treatments are necessary to cure them. We have nothing to do personally, but to avoid such people to mind their business. Don't involve with them in any affairs, lest we may become culprits. So beware of it !!