"And please explain the correlation between melanin and behavior."<quoted text>
So your argument is that crime is caused by a lack of moral sense, which is linked to IQ somehow, which is linked to black people, who you insist have lower IQ levels statistically. Is that correct? And please explain the correlation between melanin and behavior.
There is none. The correlation is between lower levels of moral sense and evolving in a temperate climate, the same climate that happened to create dark skin and the same climate that did not select as strongly for moral traits (rules of group cooperation) that a cold harsh climate with long winters did. Group cooperation is much more essential to survival in a cold climate compared to that in a temperate climate.
"No one judges others because of skin color but because of what is carried in the information. We are not frightened of a very well dressed, extremely tan Italian coming down the street. What we are frightened of is what we recognize as a male that is African American and from experience belongs to a group that based on available data is by nature violent. Human nature includes trying to protect oneself and using all available information to improve the odds of survival. We all instinctively feel safer in a brand new car than one that is all beat up and rusting out. We base these odds on available evidence, that it is more likely that an old car will fail than a new one. And it is more likely that someone of African descent, because of evolution, is more prone to violence than say an Asian, even though we do not know either individual personally. As humans, we process all information available to improve our odds against a hostile environment."
Michael Levin, philosophy professor at City University of New York