Rebecca Peretz-Lange (and colleagues') shared results and theory about why #essentialism frames can sometimes promote and sometimes mitigate #prejudice.
Dr. Peretz-Lange appeals to studies that included both kids and adults to suggest that "causal discounting" can make the seemingly contradictory results coherent.
You can find/follow the publications from Rebecca's gScholar page: https://scholar.google.com/citations?view_op=list_works&hl=en&hl=en&user=C14WR0gAAAAJ&sortby=pubdate