their own selfish needs

Australia Science:

There is an increasing amount of evidence that corrupt politicians and businessmen, unethical lawyers, some radical activists and many others who may have reached positions of authority or power have psychopathic personalities.

And these are the psychopaths we are more likely to encounter or be affected by in our lives.

What is a psychopath?

Research is critical because few who have worked in this field doubt the enormous destructive power of the psychopathic personality, a personality that seems resilient to any known therapy or intervention.