In an ideal world, politicians would rely on high quality sources of information to determine what they should consider to be true factually about the world. They could then apply their political philosophies and ideologies to the question of what public policy ought to exist.
It’s not only conservatives who invert or pervert this process, beginning with their desired political conclusions and working back to facts from there, but the conservative tendency to do so is a noteworthy feature of contemporary politics. It’s not all post-Trump either. Conservatives have disliked the implications of everything from the study of human anatomy in the context of sexual differentiation to climate change, and have often assuaged their discomfort by just refusing to accept features of the universe they dislike.
Hence ‘People’s Party of Canada’ founder Maxime Bernier’s tweet about how “CO2 is NOT pollution. It’s what comes out of your mouth when you breathe and what nourishes plants.”
While the claim has the appearance of a scientific assertion, I think it’s a clear case of working back from policy preference to fact. Even for experts like Canadian conservatives it’s hard to deny chemically that when you burn coal, oil, and gas you generate CO2. If the policy priority is to keep expanding those industries as much as possible, it becomes necessary to recast that consequence as benign or even desirable. It doesn’t seem to matter much if that’s done in a way that contradicts other claims (like there being no need to curtail supply because we should focus on limiting demand, or saying that Canadian action to curb CO2 emissions would be pointless because China produces so much more).
To an extent we all suffer from motivated reasoning along the lines of ‘when the facts don’t seem to support my beliefs, find some new facts’. The importance of understanding the climate problem, however, means we need to demand more from ourselves and our leaders in this area. Not only are people who make these sorts of climate denier comments showing they cannot be trusted to be put in charge of climate and energy policy, they are proving that they aren’t competent to lead at all.