Who better than a conspiracy theorist to report on actual conspiracies?
Conspiracy theorists don't typically report on real conspiracies, they report on imagined ones.
So having a conspiracy theorist report on a real conspiracy can actually have the effect of making the real conspiracy less believable (e.g. a stopped clock may be right twice a day, but you'll disbelieve it even then).
Conspiracy theorists are absolutely awful at reporting facts. When talking about things that are actually true, they often still manage to mix in so many untrue and misleading things that the actual truth gets clouded.
Murray may or may not have done something stupid, he may or may not have said things that were inaccurate.
But he's still basically a blogger with a relatively insignificant profile. Not a national figure with a huge reach.
When an ancient law gets dusted off and thrown at someone like him, while much more obvious media transgressions are ignored, it becomes very hard to conclude that this has anything to do with a disinterested thirst for fairness and justice.
And he got the law thrown at him and they did not for the simple reason that he broke the law, and they did not.