But the law that was being practiced/enforced is "Islam"(Sharia), it's not incidental at all. What they were doing was in accordance with the law - it was justice from their perspective, it wasn't the case that it just happened to also be true that they were affiliated with Islam.
An American slaver is not a slaver because of his nationality - that is incidental. But a court that follows Sharia law does make the decisions it makes precisely because of Sharia law. It is not that it just happens to also be an Islamic court it is because of it.
But if there were a law in America allowing you to keep slaves, then you could absolutely say that it's "American Slavery" - and you would have every right to criticize it as such without having to worry about offending an American that opposes it. And you should absolutely expect those Americans that opposed it to disassociate themselves from it.
And you're more worried about offending a couple of "Americans" than addressing the actual problem? Bah!
I have addressed the problem. I have repeatedly said that I think it is horrible, but that I cannot do anything about it. What more is there to say?
Now, the slavery that I'm talking about is the kind of thing that Disney's merchandising section does, as does Nike.
Besides, I think we've also established that this kind of thing has less to do with Islam, and more to do with tribal practices. Therefore, it is incidental.