Its possible to be vehement and still be professional, in fact if you want to succeed in politics I would say its necessary.
I believe he's handed his opponents some ammunition and that that was a foolish and unnecessary thing to do. The language detracts from the gravity of the report and from the reasonable recommendations (some are reasonable. Some sound batshit and ill considered). It suggests a referendum on the death penalty - I'm worried that will overshadow anything else.
He wants to show that he's a politics A lister. I don't think he's succeeded in doing that.
I hope the report gets some traction and helps to get justice for the victims. Im worried that he's handed his opponents a reason to dismiss it.