In understanding how human beings work, one of the things I have pondered is what motivates people. I'm sure there are all sorts of factors involved, but it seems most of the motivators fall into two categories - those which hold out the promise of something good happening as a result, and those which hold out the threat of something bad happening. I'm talking here about force and persuasion.
For a lot of people, force is the more appealing of the two. It's certainly a lot easier and quicker to use than persuasion - when persuading someone, not only do you have to rack your brains to figure out what he might like and ensure that you are able to offer it to him, you also have to figure out how to present your proposal in such a way that he will accept it. Of course, there's no guarantee that he will accept it on its first presentation - he might need some time to first become comfortable with the idea.