> But on the other, if you believe that no one cares about X, then you are less likely to begin creating X. You are also less likely to get emotionally involved in the first place which might do more harm.

"Nobody cares about X" is not the message. The message is, to paraphrase, nobody wants to spent time reading all the shit you have to say about X that isn't important to them. So if your ad (or blog post, whatever) doesn't cut out all the non-essential crap, they will move on.