Being rational is a way to process thought. However, the process of reason is only as good as your foundation premises. Foundation premises structure how you will reason and how you will interpret the very data that is used for your reasoning.
For example, we have two main political parties in the US, with both interpreting the same data in different ways. Both are being rational with the data, but each starts with a set of different foundation premises. Most people do not question their foundation premises, since there are enough people like yourself that use these. The numbers of allies in thought makes your line of reasoning appear correct and validated by the large number of people.
One basic foundation premise that many use in science is connected to a universe governed by randomness and odds. I call it casino science, since it does not see reality with clarity, but through the lens of fuzzy dice. This foundation premise is supported by a math tool, which makes it appear a sound way to reason. However, how can reason with fuzzy dice data blobs with margins of error? Unlike sharp data points, one cannot draw a single line between two data blobs that each take up a volume of certainty. The slope can vary with everyone then having to settle on a consensus, instead all coming to the exact same conclusion, independently, due to sharp data and solid lines of reasoning.
If you look the theory of evolution, one of its foundation premises starts the analysis at the first genetic based replicators. What comes before that; abiogenesis, is assigned a different branch of science as though both are not connected. This line in the sand, excludes any foundation premise that assumes evolution is a continuation of what was driving abiogenesis. This bias of tradition is connected to casino science, that tries to separate the gaming tables into different games; lottery and scratch tickets.
To be truly rational, one has to figure out which foundation premise you use, and then make sure these are rational, since if they are not, the best reasoning, based on their preconceived bias, will never get you to the promised land.
Casino science uses the same math used by gambling casinos, sports betting, politics, marketing, etc. In the news now there is concern how COVID science was too influenced by biased politics and censorship; fudge the data by data omission. The overlap in fuzzy dice thinking can allow politics to lead science the wrong way, based on picking winners and losers in the casino of politics.
I was fortunate, years ago I was doing unconscious mind research on myself, to collect good first hand internal data. This way I had solid data for reasoning the layout of my mind. There was a phase in the research where my brain laid bare my foundation premises I had acquires over my life to that point. I had never thought about it before. But as I reasoned what I had accepted as foundation for thought, it led to the disruption of these premises. After that I became free floating, since I learned the hard way that foundation premises are what keep you moored in reality. It was a struggle to find replacements but it ended better for me.