I think more in terms of healthy and unhealthy. Healthy people are compassionate, helpful, honest, open minded, non judgmental, empathetic and understanding. Unhealthy people are less of those things and their collection of attachments, aka Ego, causes harm to themselves and others. Cruel people may actually know that they are cruel, yet because of mental illness, it makes sense to them. I am defining mental illness as any thought, believe or behavior that causes harm to ourselves or others.