One attacks those who possess things that one does not possess. The attack is all the more savage because the one who attacks is destitute and the one who is attacked is well provided. The one who attacks always considers himself to be in the position of legitimate offense.
CERBERUS, n. The watch-dog of Hades, whose duty it was to guard the entrance - against whom or what does not clearly appear; everybody, sooner or later, had to go there, and nobody wanted to carry off the entrance.
There are many definite methods, honest and dishonest, which make people rich; the only instinct I know of which does it is that instinct which theological Christianity crudely describes as the sin of avarice.
The concept of "mental health" in our society is defined largely by the extent to which an individual behaves in accord with the needs of the system and does so without showing signs of stress.