There's a good argument that ignoring atrocities is a moral failure, but I think most of us can relate. There are so many evils in the world today that if I actually spent time to think on even a fraction of them I think I'd be in a mental institution.
There is ignoring atrocities you can do nothing about and then there's ignoring atrocities because your side is the one committing/contributing to it.
If you're on the side of contributing to genocide and still ignoring it, where do you think it will lead to? Someone's going to figure out how to use the apathy and profit off of it. And It's only going to get worse until it knocks at your door.
And that's how US got trump. Every war criminal president before him was more or less celebrated and are still admired by the public. They'll still call themselves good Christians. That level of cognitive dissonance is going to push the level of moral failure to its limits until it's going to start affecting themselves. But, then, you can't put the genie back in the bottle anymore.
I see that there's no apprehension of "Prevention is better than cure". You cannot wave away problems because they're only going to return worse than before.
There's also demeaning people who see the atrocities for what they are and want to create awareness so they can minimize it. But are shamed for it.