I think Monty's trying to illustrate the point that the Waffen SS in general could be separated from the Security SS by way of their role and duties. The Waffen SS were the unofficial fourth arm of the Wehrmacht and were organised into the Heer OOB. For the most part they were clearly distinct from the Security SS and there isn't a Waffen SS formation in existence that wasn't ultimately commanded by a Heer commander.
The Waffen SS were no innocent, honorable soldiers, although on many occasions they fought with honour and almost always with bravery. They committed attrocites but then so did the regular Heer, so did the Red Army, the Polish Army, the French Army, the British Army, the American Army, the Japanese Army. There isn't an army in any major conflict that doesn't have an element of atrocities attached to it. That happens to be the very sad nature of war.
Of course some units of the Waffen SS had their origins in the more political units of the SS. That's unavoidable if you ask me, seeing as the organisation started out as a purely political organ. That doesn't mean to say that later on a distinct line couldn't be drawn between their duties and those SS formations that undertook camp security and rear echelon duties. There are many instances of Waffen SS units distinguishing themselves in combat. Like II SS Panzer Korps at Kharkov and Kursk.
"An Emperor is subject to no-one but God and justice."
Frederick 1, Barbarossa