There is a philosophy by which many people live their lives, and it is this: life is a shit sandwich, but the more bread you've got, the less shit you have to eat.
These people are often selfish brats as kids, and they don't get better with age: think of the shifty-eyed smarmy asshole from the sixth form who grow up to be a merchant banker, or an estate agent, or one of the Conservative Party funny-handshake mine's a Rolex brigade.
(This isn't to say that all estate agents, or merchant bankers, or conservatives are selfish, but that these are ways of life that provide opportunities of a certain disposition to enrich themselves at the expense of others. Bear with me.)
There is another philosophy by which people live their lives, and it goes thus: You will do as I say or I will hurt you.
Let me draw you a Venn diagram with two circles on it, denoting sets of individuals. They overlap: the greedy ones and the authoritarian ones. Let's shade in the intersecting area in a different color and label it: dangerous.
Greed isn't automatically dangerous on its own, and petty authoritarians aren't usually dangerous outside their immediate vicinity — but when you combine the two, you get gangsters and dictators and hate-spewing preachers.