It's not so much a matter of encouraging debate, that's not a problem at all, it's a question of presentation. The fault lay not so much at the feet of the science, in either direction, it lay at the feet of the Media and the way it chooses to present that debate.
With every scientific theory out there, there are dissenters, even the old favourites such as Newtons' theories on Gravity are constantly reviewed and challenged (see MOND, an alternative explanation to Dark Matter), there's nothing wrong with that, the problem is that people present this as a schism in the scientific world when it is actually 'business as usual'.
Now we are left in a world where scientists who think otherwise are being told by media that they will be hounded and harassed by the community if they challenge the established norm, as though this were a new thing, when in truth it stretches back to the days a meteorologist dared to notice the similarity between distant coastlines, Continental Drift wasn't accepted for a long time because the wrong type of scientist suggested it. There will always be resistance to opposition, science is designed to withstand that.
If you look at most media reports, they always 'simplify' their scientific explanations, and usually lose vital information in the telling, it's odd, because they never do that in the financial pages, whilst that is not the case here, there is a growing trend of media to take something that has been commonplace for centuries and presenting it as though it is something that is tearing the establishment apart, it's been so succesfull that many people believe this to be so, invluding scientists, who on occasion have been guilty of letting their egos over-ride their professionalism, on both sides of the debate.
The worst part is, when scientists refute claims levelled against them, people automatically assume they are simply covering their own asses, which isn't impossible, but certainly isn't definite either, but to assume these concerns are being ignored entirely is possibly a fault on the part of the reader, the act of peer review is alive and well.
Edit: Look at it this way, if we sit around and do nothing whilst we wait to be 'absolutely 100% certain' scientifically, we will never get there, we aren't '100% absolutely certain' that the Moon goes around the Earth. Like most Democratic systems, it's better to go with the majority opinion (which is, in essence, the soul and centre of science) and assume a positive effect unless new data reveals otherwise, otherwise, I can see some alien archeologists having a damn good laugh at us in the distant future if we sit around twiddling our thumbs because we weren't completely sure it was going to happen.