At birth we're all just animals. The poor tend to remain closer to that level. They tend to be uneducated, i.e. aren't sufficiently taught acceptable social & lawful behavior, therefore tend to act in more animalistic/ barbaric ways & are more likely to manhandle a situation rather than finesse it, i.e. They're more likely to act before thinking; Take instead of asking; Steal instead of purchasing; Take even when the answer is no; Act on feelings/ wants/ desires rather than showing restraint.
And of course in the US the poor tend to be the current minority groups: blacks, hispanics, etc.
Blacks tend to be poorer due to the fact that their ancestors were owned & treated more like possessions or animals, & it is taking many, many generations to try to increase their social level from the very low level they started in.
Hispanics tend to be poorer due to the fact that many have immigrated illegally from their poor home country & it is taking many generations to try to rise out of the hole they started in.
I'm white. I don't enjoy these situations; This is just logically how I see it.