Well, that's how I see it: there are people, I call them lower class, that accepted the fact, that Bertram is Red John. There's not too many people in that group, but still...
However, we know that they are wrong, right? That's when the middle class enters: it's McCallister! Because we see him in the promo! Now let me be clear: I know, that it's Sheriff in promo. But if you guys think, that Heller would actually allow to put the real Red John in the promo, even in this way, you are... well, you are middle class.
Then there's the elite. The people, who know, that McCallister thing is just as the Bertram thing - only a little more sophisticated. It's a trick. It doesn't matter whose your candidate: Haffner, Partdirge, any of the Kirklands or even Stiles, you are the elite. Because you watched the show, all of it's 6 seasons thoroughly, and you understand - it's never that simple. The Mentalist is all about sudden twists. And I believe, that this is what's happening. It's not Bertram. It's not McCallister. It's one of the other suspects from the list.
ANYWAY, since I'm going through surgery this week and it will not be possible for me to post here for a while, I wanted to thank you guys for all the fun we had for the last few years with guessing who's that son of a gun ;) congrats, for all those who guessed right. And remember: if any of us needs help in the future, just whisper: Tyger Tyger... ;)