If I had to make a hard guess, I'd bet it's two things actually. The first is that a lot of folks are genuinely scared that any of the comic companies will come after the game, and COH will be shut down again. It's not going to happen, and the devs at present don't seem to share the same concern AFAIK, but it's still a fear even if it's unfounded. Can't blame someone for that too much I suppose. Second is this undercurrent of people playing the game differently, which you see crop up in other areas here too (PL and AE somewhat). This game isn't going to have a homogeneous playstyle, that's really what attracted a lot of to it in the first place. For the most part, we are all going to have to get along and adopt a live and let live approach unless it's something that directly impacts the games longevity. And I trust our devs and community mods to let us know when that's the case.
I'm glad this is the type of game that inspires this type of passion in people, even in the form of worrying. Just goes to show you how dedicated our playerbase is. I hope we can eventually come together in some consensus on this, or get a dev's input to lessen some of these worries.