why do some whites fail while others do not? why are there white drug users, white criminals, white unwed mothers, whites who don't graduate, whites who can't hold down a job, etc, etc? what are the reasons? is it class background, SES, bad parenting, bad luck, environment, genetics, intelligence, lack of opportunity, peer pressure, impulsiveness, ADHD, ADD, etc, etc? is it a combination of one, some or all of those things, depending on the individual? are all of those factors equally important, or are some more common to most problems, in most of the individuals? how would you find out? perhaps you could study groups of people who all had the same problem and find out if they had any common general characteristics. and of course you would have to study a group of people without that problem to compare with. repeat the whole scenario with different problems. compare one type of problem to another, etc, etc. of course this has all been done. many times over many years. can anybody guess what factor shows a statistically significant correlation in almost every study?