It could just as well be one person stating his opinions. His opinions are controversal, and therefore they generate lots of responses (derailing) and he is downvoted because they go against what most people here believe. Doesn't quite seem like an army of professional "trolls" manipulating the discussion (If he is a troll, he would probably have presented his statements more effectively or subtly. The way he did almost guaranteed being downvoted).
Those "troll groups" are surely not a good thing, and you can never be certain this person wasn't one of them, but I also wouldn't label everyone I don't agree with a troll, just because they dare to write down their opinion, and my point of view is the one of the majority.