http://www.newsforage.com/2015/12/isis-orders-killing-of-children-with.html
Kill everything that ain't 'normal'.  Why not just kill 'em all?
Actually, they might.
(I knew someone with Down's once.  He was hard to understand since he also had a speech problem, and you had to be around him all the time in order to 'translate', but he was nice, and ya know. . .I think he was smarter than your average person around here.  He helped us out a few times, being he and his wife lived in the same complex.  There's also actors with Down's, and it doesn't mean you can't be productive.)