Of course culture plays a role, as does education level of one's parents, access to opportunity such as good health care and higher education, the role of the criminal justice system in your community, the stress of dealing with basic material needs, etc, etc. Point being the cards are stacked against you if you are born into poverty, and those who escape it are basically the exceptions that prove the rule. So if we were sane, we'd focus our attention on leveling the playing field so as to lower the barrier to entry into the middle class, and not focus attention on blaming poor people for having poor values.