This is why I mentioned political ideologies and narratives too.
As for allowing in only what mods agree with, I haven't observed such a thing. In fact, Uber stories serve as a great example. Since the first stories many years ago to this very day, HN community remains essentially split between those who love Uber and focus on the benefits it brings vs. those who hate Uber and focus on their anti-social business practices. Nowhere I've seen mods trying to force the discussion in favour of either side.
(And Uber stories are like catnip for me, so believe me, I follow those discussions closely.)