Is the outrage in this article because of the practice of capital punishment or the fact that adultery is a capital offense?”
The outrage is over the practice of stoning, AND that adultery is a capital crime. You are not outraged? You think stoning someone to death for adultery is just fine?
Hanging isn’t a very sanitized form of capital punishment, we’re you outraged when Saddam was hung?
Would you be outraged if Saddam was stoned?
And as for Adultery being a Capital Crime, I haven’t heard any moral or non-moral, for that matter, arguments proving that Adultery should not be a capital crime besides the ones based on emotion.
Why shouldn’t adultery be a capital crime or jaywalking for that matter? I'm being facetious here but adultery is not a capital crime in most people’s minds because we don’t value faithfulness, vows, or marriage but if someone kills someone we accept murder as a capital offense because we value human life just not marriage.