I think you're on to something here, Mo. I don't understand this ugly phenomenon either, but I think the things you mentioned contribute to it. 

I'd add the immediacy of social media. In the era of letter writing, many an angry letter was torn up before it was mailed once the writer cooled down and thought better of their first impulse. Now so much goes out that's unfiltered and undeveloped, sometimes with tragic consequences.

Distance is another factor. It's easy to forget that the person on the other end of a hateful message is a human being. Like the general who orders the firing of a missile from 1,000 miles away, it's easy to harm another when you don't have to witness the results.

These liturgical shamers are critiquing isolated moments that validate their biases. But no single photo captures the whole truth, especially when it's viewed outside its original context. Community worship is an intimate act, and those on the outside should be circumspect in their judgments.