This is why people should be more aware about the people about them whether friends or family. When someone always looks out for only him or herself to the detriment of others, that person is up to no good.
People who oppress the weak, take food from the mouth of the poor, intimidate the insecure, deceive the unsure are wolves and they are never ferocious looking or evil smelling.
They tend to be amoral, they can't differentiate between good and evil and as far as it gets them what they want, they are ready to do it.