One thing I've noticed over the years is that the less self-control people have, the more control they seem to want over others. The extreme examples of this correlation are sociopaths, who lust for power over others, yet who have absolutely no control over their own appetites and desires and emotions. Narcissistic personalities, who are sort of mini-sociopaths without the viciousness, are usually bossy, yet always seem able to justify their own self-indulgence. Self-disciplined people seem to feel less desire to be in control of others.
Think of the people you know. You should find that this rule applies.