If you're managing traffic, sure, but I think the situation is analogous to a different social situation.
It's well known that a messy city with a litter problem encourages people to litter. After all, everyone else is doing it, so everyone develops bad habits. At which point you need someone to come in and clean it up. With a nice, clean city, people are naturally more inclined to keep it that way. Yay! However, if those same people keep littering after the clean-up, clearly they don't want a nice clean city, at which point you're wasting your time trying to clean it up for them.
If we want a strong signal:noise ratio, we can actively remove the noise. But who is 'we' in that case? The moderators? If that's not what the users of B3D want, we shouldn't be changing their conversations for them to make them what we want them to be. And if high signal:noise is what the users of B3D want, they need to be able to manage the signal:noise ratio themselves without leaning on mods. Otherwise you have the scenario of a city of folk claiming they want a clean city as they throw crisp packets and cigarette butts around the place expecting someone to take ownership to clean up their messes for them.