The lack of self control I refer to does not necessarily refer to indulging in all the seven deadly sins all the time; it is more a lack of emotional self control. Controlling types may be extremely disciplined in some ways; but inevitably there is a complete lack of self control in some basic way.
They may be able to get themselves down to the office every day, dress neatly, and keep their houses immaculate. They may keep their own eating and drinking under control. But they tend to become enraged at things that wouldn't bother most of us. And if they are not in a position to assert power over others, they try to do so indirectly through constant, carping disapproval.
We all get angry if someone does something which harms us directly. But we tend not to get angry if people do things which don't affect us personally. A certain type of person will talk about someone else's dress, or spending habits, or taste in paramours, as if it is a direct, personal affront to him.
It's a direct correlation: the less self control a person has, the more control he wants over others.
Sociopaths are the ultimate example of this, and serial killers are the ultimate sociopaths: they kill partly for the pleasure of being able to control their victims' destiny. It is often said serial killers will sometimes slow down the killing process just so they can draw out that pleasure.
I was reminded of this last night when I watched a show about Wichita's BTK ("Bind Torture Kill") Killer, Dennis Rader, who would start to strangle his victims, and then, just when they were about to die, loosen the ligature around their necks so that he could do it all over again.
When he wasn't killing women, Rader was a dogcatcher and supervisor in the Compliance Department in Park City. He was locally famous for his extremely strict enforcement of regulations, in one case having a dog euthanized for no good reason.
Scratch an officious busybody, find a nasty control freak.
Your average controlling personality acts more like Rader-the-dogcatcher than Rader-the-serial-killer; but the basic psychology is not dissimilar.
I racked my brains trying to think of a single example to the contrary: either a decent person who constantly tried to exert his dominion over others, or a nasty type who didn't. But I couldn't.