A long time ago we actually agreed on a process for fact finding. It is one that has served us well for hundreds of years (more so in the last 150 years, once we really had a foundational understanding of the world based on previously established facts). The whole “you look at the world, draw conclusions and test them” - system is not new and it works. That is science. It’s not a question of what people believe to be fact, but in believing in the process of establishing them. One side is systematically trying to undermine the very basis of science. It is impossible to use science or data or facts to convince someone like that that their position is wrong.