So find, upvote, and participate in — or, if necessary, create — a thread that offers the kind of discussion you're hoping to see. Coming into a thread that's not the discussion you wanted, and being all, "But guys! We should be talking about $other_thing!" is an even more annoying dinner party guest, IMO.
In my defence - the $other_thing is the actual article though.
It's also that there are some predictable topics. Every post about a new Google product has someone bringing up the Reader shutdown and every post about ORMs has someone talking about how much they prefer raw SQL...
