Why do you think controlling people are the way they are?

And some people are not controlling all the time, but only at certain times. Why do you think they go from being a normally agreeable person to controlling? I have a few thoughts (below) and am interested in what others think.

1. They have some one in their life (significant other? sibling?) who is controlling towards them, and when that happens, they then turn around and try to exert control over others in their life.

2. They feel (whether temporarily, or more as a normal condition) that life events or circumstances have left them with very little control over their choices, so seek control wherever they can find it.

3. That’s just part of their nature?

Is everyone controlling at least some of the time? I know there are times that I find passive/aggressive ways to feel like I have some control over things.