Please note, I did not call mhartl a man of "no real ethics, a sociopath, dangerous, self-serving, and someone to distance yourself from."
I did say his ethics are weak, and I stand by this. Assuming he believes what he says, his anti-social position on the obligations of the corporation speak for themselves. And I did note that, when carried to the extreme, blind spots like the one shared by mhartl do, in fact, produce the litany of wrong that I mentioned (a position I REALLY stand by, having worked for people I wish I hadn't).
I did not, however, say that mhartl himself represents these extremes. That's an important distinction. And if, as you say, he is an honest, well-intentioned, and generous man, then perhaps he arrived at his current position for some benign reason - a lack of careful thought, or maybe an insufficiency of experience. In any case, people who share his lack of concern have become responsible for some very major damage. This aspect of his thought is not incidental to the problem, it IS the problem. Or, rather, it is an essential component of the problem.
Just consider what the OP is arguing. The faults of shareholder capitalism are not minor. Indeed, they have demonstrated a destructive power that has decimated companies, portfolios, and - at this late stage in the experiment - entire economies. This is not "creative destruction". It's shoot-yourself-in-both-feet-then-wonder-why-you-can't-walk destruction. And while we can demonstrate how bad it is now, there was no need to learn by doing. Had we considered the ethical failures inherent in mhartl's arguments sooner and more seriously, the crash of 2007/8 may have never come to pass.
Again, we're talking about a line of thought that has produced deep and lasting harm in the lives of billions - but not without racking up billion dollar gains for a microscopic minority who have responded by using their inordinate power to capture and corrupt the government we all depend on. This is really bad stuff. Historically speaking, this trajectory reduces citizens to subjects, and the weakest to slaves. Whether he realizes it or not, thinking like martl's supported the wrong side of political situation that has made itself the dominant evil of the day.
It needs to end, and the generation that does end it will probably spend the remainder of their lives cleaning up the mess. The sooner people disabuse themselves of the notions that allowed shareholder capitalism to spin so wildly out of control in the first place, the better off everyone is going to be - mhartl included.