You're confusing Conservatism with 'small-c' conservatism.
Democrats can be conservative and traditionally (in my lifetime at least until Trump, Republicans generally espoused 'small-l' liberalism (as do most democrats too).
It's not rejecting new information, but being generally cautious of making major changes to 'fix' something that is determined to be broken by the new information.
In relieving the glory days of country (basically pre 2016), a good example would be someone noticing too many pedestrian traffic deaths and some Democrat finding a study that says that while minimal, painting white stripes across the road does gets drivers to pay a more attention. If they were less conservative and more progressive, they would demand that they paint every crosswalk like this. A conservative (most likely a republican), would say, are you sure it'll be helpful, that's a large costs and may not be the best solution, let's maybe only do a few of the higher risk areas and see if it helps. The Dem would then scream that the Republican hates walkers and wants them to die, they'd get their funding and paint everything. Years later when (assuming other variables don't change) pedestrians getting hit has either gone up or stayed the same because of the fact that we know now that while it does play some role in getting drivers attention, it gives pedestrians more confidence to cross without paying as much attention. Depending on the road style, Pedestrians getting struck either went up due to painting them or no difference was noted.
Now we know that if you paint actual art, at least during daytime hours, you see a significant decrease in pedestrian incidents as the driver pays much more attention and it doesn't give the pedestrian a more secure feeling, so it keeps them alert as well. But due to the Democrat, no money is left to pay for murals and that same Dem is now running for governor and touting how they got all the crosswalks painted as a 'win' and all the non 'small-c' conservatives cheer them on.
I miss those days.