There's little kindness in breaking the grand comforting delusion of a dying delusional mind.

Just let them go in peace, to do otherwise would be needlessly cruel.

Or, maybe they deserve that cruelty: I don't have every relationship between every theist and atheist.

Just be aware that it is cruelty.

Some may deserve that, some may not.

Or you could just not be there.

That's all between you and... well, you.

Now that that's done and dusted, may we return to discussing the affairs of the living?

The cruelties repeatedly and incessantly enacted upon some category of them, by one particular group or another, because they don't share some particular principle or value in the way they live their lives?

The cruelties that are themselves mandatory ritual elements of those particular group's worldviews?