I don't see Somali americans doing bad. Just few bad apples which are found in every ethnic groups.
Take a gander at the bottom of this list
https://en.wikipedia.org/wiki/List_of_ethnic_groups_in_the_United_States_by_household_income
But to answer the question the thread is asking, it’s basically just really bad parenting. Somalis just plop them out for welfare and neglect them then coinflip if the child is retarded enough to be a criminal