Leaving those lies unchallenged would be journalistic malpractice.
On the other hand there is a large group of "I don't believe humans are a major contributing factor." Given what we know about the planet's history it's foolish to consider these ppl deniers. They believe. It's the cause they don't agree with.
This is becoming a classic case of too many people being worried about the wrong problem. Deniers aren't the issue. It's the "it ain't because of humans" cluster.
I think that group is much smaller than the group of people who don't want to make significant lifestyle changes and are hoping that things won't get bad until after they're dead. Unfortunately there isn't a good way to break that cycle without confronting the problem — just as is the case for anything else where the feedback is substantially delayed. The thing which will probably move the needle on climate change will be insurance skyrocketing or disappearing and governments choosing not to rebuild in high-risk areas, because that will make the risk real enough not to downplay.
What do you think would be a more efficient way to encourage those steps?