Not necessarily. Especially when you consider how some people here consider the simple number of pages a thread has as an indication of how much "support" the initial thought has (rather than acknowledging it could be a thorough discussion with people on both sides). It's not "white knighting" at all to make one post about a topic saying you enjoy it in a forum surrounded by a bunch of other negative posts. Positive feedback is feedback, too. Or is that the plan? Say "this should be about criticism, anybody posting positive things is just a shill" then saying "see there's only negative posts here, the devs are horrible and should change everything they do." There's no honesty there. It might not help the perpetual naysayers to see people posting positive comments, but it does in fact help everyone to show that said naysayers aren't the norm among the wider playerbase.
Frankly, it amuses me to see how the same people will claim there are all of these other sites that are utterly and completely intolerant of any negative comments about the game, just filled with oodles of people praising the devs, and how these forums are the only place where one can post negative comments...and then in the next breath claim that the negative comments from our few dozen or so folks here are somehow massively representative of the wider community and should be taken as the norm.
It's actually quite telling that even with the echo chamber here, the naysayers can't even allow one positive topic to exist without coming in and trying to passively-aggressively disrupt it or take it down. It's sad that people are so negative, they can't even accept other people having fun. That's when it's time to step back, take a break, and realize one might just be taking a game too seriously.