They are not at ALL doing that. What they are doing is twofold.
First, they are giving those theories a wider voice. It would only be a debunking if they slammed the theories so hard it was embarrassing to think this crap (it is, and they should, but they won't). The MSM aren't hurting the DUmmies when only the far left has heard this crap so far and believed it. They're just spreading the word!
Second, the MSM are positioning themselves as mainstream again. "See, we weren't agreeing with those loony leftists--we MUST be moderate!"
Jennings can eat my shorts.
Yup. It isn't what they are doing, it is what is being reported. The public can be easily manipulated with words. Not only in media, but also in school and church.