It wasn't a properly controlled experiment to begin with, nor was it repeated. General conclusions should not be drawn from a single, flawed study. But it makes for good headlines and talking points.
Actually, all of them are bs. There’s no records of the experiment in Australia. I would guess it’s just a hoax by the author of “behind the shock machine” if not, it still certainly doesn’t count as a replication.
And some people really WANT to believe it's true. They've built their entire worldview around it and the idea they've been duped would cause a massive narcissistic injury.
Small but important nitpick. I think, most commonly their worldview was already built, and would have been the same regardless. Milgram just provides a veneer of legitimacy, losing which would cause problems for them.