Being subject to crime, drugs, poverty, etc. for a lifetime will obviously affect someone and present gigantic challenges to success. This occurs far more in black communities than white, in large part because racism over the generations has prevented or slowed growth for blacks while encouraging it for whites. There's a cumulative effect. Add to that degraded access to basic needs like healthcare, education, housing, jobs, etc. create far greater challenges in the black community at a macro level. Certainly there will be those that have fewer challenges and are able to succeed, but that's too often the exception rather than the rule.