It's sad it's come to this, but MSM outlets don't seem to worry about repeated exposure of their "news" stories as false, so consequences beyond "professional" embarrassment and loss of readers/listeners/viewers seems necessary. Maybe the cost of lawsuits will bring about the prudence actual ethics should have engendered.
That this narrative/meme is false has been known since a few days after the Giffords shooting, making the "malice" hurdle jumpable, IMO. The NYT might be very wise to publish an, "Oh, crap, we F'ed up!" apology and pay Sarah Palin a couple million. Not that I expect such wisdom and humility from the NYT.