Rather than dividing the world between good and evil, the Left divided the world in terms of economics. Economic classes, not moral values, explained human behavior. Therefore, to cite a common example, poverty, not one's moral value system, or lack of it, caused crime.
{poverty, not one's moral value system, or lack of it, caused crime.}
I don't understand properly this sentence. but what I infer is: it doesn't matter if one person has moral values rather than if he is poor, because poverty causes crime. Is it right my inference?