Either has a vested interest and is secretly accumulating and...

Either has a vested interest and is secretly accumulating and trying to influence the SP with his malarkey on HC (doubt it)

Or might be trying to act on pure good will to try and help people avoid losing their money on this stock (doubt again)

Maybe just has nothing else to do in life other than bash BRN's holders and the company itself (very likely)

Is invested in a competitor (not that there are any on the ASX) and wants to swing opinions (doubt this also)

You know what? It's like asking if heaven is real.. nobody will really know what the motive is because SM would never admit it nor would it be correct even if there was some reason