Did you even read it? He mentions that, and also He says that the regime is 'odious' right in the beginning, and is looking more from the US self interest and strategic perspective.

"It certainly did not help that the United States had stood idle while the regime slaughtered tens of thousands of its opponents, before making the attempt,"

"Now, before we go forward, I want to clarify a few things. First, none of this is a defense of the Iranian regime, which is odious. That said, there are many odious regimes in the world and we do not go to war with all of them. Second, this is a post fundamentally about American strategy or the lack thereof and thus not a post"