You can't please everybody. No matter what you do, there will always be some people who don't like what you do. If you start to remake everything just because some people dislikes it, you will most likely just end up with something else the same group dislikes or you upset another group of people that thinks that it should be rewritten again.
That said, of course they should listen to what people say (and they most likely do) and they may do changes here and there.
You are right, of course.
However, the way I see it, the game itself isn't actually made for the benefit of its authors or publishers; it's made for our benefit — we, the players who look to play it.
The sales revenue the game garners is the part that is for the publishers' benefit — and that is what they'll primarily need to safeguard.
And, even so, I still agree with you — as long as those who express displeasure with the worldbuilding are, as has been suggested, just a few loudmouths and malcontents, then they can indeed be shrugged off as irrelevant, regardless of whether their complaint has cause or not.
But — if the portion of the consumer base that is dissatisfied with the product should turn out to be large enough to actually affect the post-Kickstarter sales — then taking proper heed and thoroughly addressing the issues causing the dissatisfaction while doing so still is relatively easy would strike me as a wise course of action.
Right now we can only speculate of course, but it does seem to me that it is not all that far out from the realms of the possible to think that the #2's of my list actually are a fair bunch.