@Olga009933
It's downright ignorant to assume a person's religion by their ethnic appearance.
I disagree with this and think it's actually quite fundamental. You are talking here about pattern-recognition, and calling it ignorant to recognise that there are patterns we see in the world around us, if they relate to subjects that can be sensitive.
The way to handle patterns that can be sensitive is with sensitivity, not to pretend the pattern isn't there and then name-call.
I found I could tell the difference at sight between a Kosovar Albanian and a Serb fairly well in Kosovo. If I can, then I'm sure you can too. That correlates to religious identity almost 100%. Does it make you ignorant if you know that too? No, the opposite in fact.
Some patterns have many exceptions, some have few exceptions.
But, just like assuming someone with a Australian accent is Australian isn't ignorant, (though it might turn out to be wrong, or foolish if it's a high-stakes matter), it's not ignorant, or morally defective, to observe differences and patterns in the world.
In this case, it was partly that idea that let this atrocity go on for so long.
In so many aspects of public life, we make ourselves ignorant because we can't trust ourselves to be sensitive.