The zero sum game aspect is a good point.
I think an additional issue is that some people have an inflated sense of the power of message board arguments, thinking that it will affect the outcome, partly due to the accessibility of creators online. So if you want something to happen in the comics (IE- Wolverine's return) a comment about how it might not happen (that might incidentally come from someone who might like it to happen) could be seen as a threat. What if it ends up encouraging someone in power?