Why is this so hard for the right?
There is nothing wrong with calling out individual people when those human people do ugly things, like the piece of **** mentioned in the OP (I'm assuming the truth of the allegations).
There is everything wrong with calling out Islam, when one person of the islamic faith does an ugly thing.
I don't know - and do not believe - that anybody honestly misunderstands this. It's not only gross, stupid, and unfair group condemnation, it's also the rankest hypocrisy. You don't "call out America" when an American commits one of the 1,400,000 violent crimes committed here every year, so why call out "Islam" when one person who happens to be Islamic says that sex slaves are cool?
You don't call out Christianity because the bible talks about executing homosexuals and even sons who "curse" the father, and you wouldn't do it even if you could find some crazy secret group of 4 Christians who follow insane mandates from the bible. You'd say that no, those are just some bad apples. Why can't people say that about muslims? There are 1,600,000,000 of them.
That's a lot. And certainly, when you look at poor rural areas in places like Aghanistan, there's an unfortunately high rate of medevil thinking. But that's not "Islam" or "muslims"; that's a half-***ed nuanced approach that at least recognizes that you cannot hold 1.6 billion people accountable for the actions of anyone other than their own, individually.
This really shouldn't be so hard.