The "big dog" takes the bone from the smaller dog.  Dominant males use elaborate rituals to chase away lesser males and, thereby, achieve control of the breeding pool.....usually without actual battle.....simple bullying is adequate.  In the canine world if a bitch has too many pups, the stronger ones force the weaker ones away from the teats and they starve.  How many examples do you need?  In fact, we homo sapiens are virtually alone in our caring for the weaker members of our society.  It's ocassionally seen in other animals, but it's a rarity.  

Among humans there have likely always been bullies.  We all remember some from our own "school days."  Are there more today are are they just more "open" about it?  I'm not sure.  I do know that we've elected a President who is as great a bully as any man I've ever seen.  Frankly, I don't think that speaks well for our society or bodes well for our future.  Gary Crum