I wouldn't assume it was an intentional strategy. Papers and magazines have never been shy about critiquing themselves. (At least, the better ones haven't.) Back in the day, it wasn't uncommon to see an editor at the New York Times take a staff reporter or columnist to task in a sidebar, or even in a followup story. And the role of ombudsman used to mean something. (Whereas today, it's a very underappreciated and little-understood role.)
Second, we shouldn't necessarily presume that writers at the same paper are coordinating with each other. Say what you will about that as a business practice. But it's a fact of life at many publications, with distributed staffs, section-specific editors, shrinking numbers of full-timers, and ever-increasing numbers of independent contractors. I wouldn't attribute to malice what can better be explained by uncoordinated action.
[EDIT: This comment got a downvote, and I'm guessing it's because someone assumed I'm defending the Guardian here. Just to be clear, I'm not. When I say that people aren't always coordinating, I'm not offering that as a defense of lack of coordination. I'm offering it as a possible explanation. Clearly, a lack of coordination is a bad thing.]