He's using sarcasm to dismiss off the bat anyone who may seriously claim that Murdoch et al are responsible (yes, there are people who honestly believe this).

He's using sarcasm to dismiss off the bat anyone who may seriously claim that Murdoch et al are responsible (yes, there are people who honestly believe this). This is a very common literary structure in internet comments. To claim we can't satirize or mock racists and bigots because the satirical content itself is racist seems misguided. Intent matters.