I guess it's part of "cultural" differences
In Croatia everyone is full of sarcasm. And when someone leave posts like this one about "doctor" that almost praises american behaviour in prisons, after all those photos and shock in all world Croats usually don't see any point in trying to use arguments with such. No, they will rather compete to find the most sarcastic ways of response.
Of course, that goes like this only when it's really terribly annoying thing, not when you don't agree in some normal views.