@pzmyers You have to remember that this kind of mentality isn't about saying what they actually believe; it's about persuading naive 3rd parties to form a mob (aka human bot army) which can then be directed somewhat arbitrarily through appeal to emotional hooks.

By assuming falsehoods in their comments, they can persuade the easily-persuadable, as well as enlisting others of their kind whose main ambition in life is to one day be at (or near) the head of a *really big* angry rabble.