It would be irrational to go for medical check ups when they aren't necessary - if you did it every 3 days, for example.
I'm looking at this from a birds eye view. A lot of people get unnecessary screenings, which tell them information which is not worth acting upon no matter whether it says that it is positive or negative, and then start worrying and getting unnecessary testing and treatment. Information is only useful to the extent that you can act upon it.
I'm looking at this from a birds eye view.
And from up there you take it upon yourself to judge whether personal decisions are rational or not? I think you're way too far away for that.
A lot of people get unnecessary screenings
That's a different issue. In a post upstream you made a rather amazing claim that additional tests after testing positive for cancer on a screening would be irrational. Do you stand by that claim?
Jason Mitchell is [edit: has been] the John L. Loeb Associate Professor of the Social Sciences at Harvard. He has won the National Academy of Science's Troland Award as well as the Association for Psychological Science's Janet Taylor Spence Award for Transformative Early Career Contribution.
Here, he argues against the principle of replicability of experiments in science. Apparently, it's disrespectful, and presumptively wrong.
This is why we can't have social science. Not because the subject is not amenable to the scientific method -- it obviously is. People are conducting controlled experiments and other people are attempting to replicate the results. So far, so good. Rather, the problem is that at least one celebrated authority in the field hates that, and would prefer much, much more deference to authority.