I'd generalize this to psychopaths; it's called superficial charm for a reason. They can be quite nice to talk to but they don't have any concept of loyalty and

I'd generalize this to psychopaths; it's called superficial charm for a reason. They can be quite nice to talk to but they don't have any concept of loyalty and so will betray you without a second thought as soon as its advantageous. The smarter ones do very well in large organizations.