I don't know about the Houla massacre. My point was that the argument of the article you posted is unimpressive, for the reasons I gave. Perhaps you could respond to those reasons.
You don't have to. You can respond or not respond to whatever you like. As can I.
In the meantime, I am more inclined to believe Syrian revolutionaries, like the one who wrote the article I linked to.
By the way, by 'argumentative need' I think you mean that you thought Mark was losing the argument. Well, no.