Taking a piece of speculation and using it to further your ax-grinding is one thing but the fault for that lies not on the one doing the speculating but on the ax grinder themselves. They are, after all, the ones who are taking those speculations and using them to strengthen whatever their argument is. Any piece of speculation, good or bad, could be used in such a manner and, if we wanted to get technical, even those who view Bendis's work in a positive light do the same just in a more positive, and therefore, acceptable manner. It six one way, half a dozen the other really.
Personally, its absolutely fine for people to be worried and to voice those concerns if they feel the need. Its likewise just fine for people to not want to read the books because they feel a writer isn't to be trusted with a character they love. I really don't see a problem at all with either of those things.