Depends on how they were RAISED. If you put a kid in front of screens all day, feed him junk food, over discipline him when he “gets on your last nerve” but otherwise let him run feral, teach him nothing other than how to speak incorrectly and expose him to crack smoke, yep you’re going to get a dullard.
I forgot the exact figure but something like 90% of black children are born to single women and know no father. When get into teen years the gangs become the father figure.