Piss Christ vs Onion article re Chris Brown beating Rihanna to death - Are these equivalent?

Per this article the author makes the following assertion.

Are these equivalent pruderies?

No, they aren’t equivalent. Piss Christ was never an attempt to be humor. It was entirely social commentary. The Onion’s story involves humor and thus causes people to laugh at descriptions of the negative action.

A better comparison would have been something like South Park’s or Family Guy’s way of looking at religion. In fact, I think this exact joke could be used on either one of those.

And, note, I like South Park and only dislike Family Guy for the humor, not the offensiveness.