The problem that Reuters faces is that its commenters are essentially trying to grab Reuters' carefully built and maintained megaphone and yell their own stuff. There's no way to reconcile the commenter's desires and Reuters desires to not share their megaphone (as such sharing degrades the utility of the megaphone precisely to the extent that the commenters are successful in shouting their own stuff).

There's no "laziness" here, because I'm yet to see even a hint that there is a solution to this problem, despite massive efforts. There's a fundamental conflict of interest. Consequently, commenting on "primary" news sites is uniformly atrocious.

Show me one news site with the reach of Reuters... no, that's hardly fair, show me one news site with a tenth the reach of Reuters that has anything resembling an edifying commentariat.