Why do cowards and scums lust after power even though they are not qualified to wield it?

I submit that most, if not all, life's problems stem from

1. Greed and selfishness.
2. Lack of love.
3. Love of power: ignorance of the nature of power and thus inability to wield it wisely. In fact, several critical thinkers (Hegel, Marx, Nietzsche, and Adler) and many laymen think human relationships are built on power structure.

All the above three factors are merely manifestations of an over-preoccupation of Self, thinking that the Self is different from the Other, and life's purpose is to gratify and satisfy what the Self wants, and not to work out a co-existence with the Other. On a personal note, as I wrote the above words, I could not help but recall an unpleasant encounter about two years ago when I happened to run into an overly assertive but ignorant fellow, who ironically tried very hard to show me, a reader and a thinker, that he "knew" a lot of subjects. He was pitifully trying to establish a "power" relationship with a wrong person. There are many people like him in this world who instinctively lust after power, but are not wise enough to use it effectively and beneficially for all people affected. 

Jared Loughner is no doubt sick. And his sickness is exacerbated by his feeling that people have power over him. So he must do something to redress the feelings of powerlessness and dislocation inside. I was once criticized that I should not venture any musings on psychology and that people that went on the Internet not to read about  psychological speculations. But doesn't everything we say and do is a reflection of our psychological make-up? The posts that I have seen in the Internet reflect the psychological preoccupation of those who do the posting: from sex and jokes related materials to news about Vietnam to propagating info about China to passionate essays about the necessity to defend Vietnam against China. 

As I have reiterated ad nauseam, reasonings had better be rational and sound. Weak arguments only invite laughter and lack of respect.