I'll match your evidence-free comment with one of my own: you have no idea how hard we work to do just what I described above, and how much pressure we come under because of it.

Re what you've "seen happen several times over the last decade": I'm sure you've seen some dots, but how you connect them into the picture you've got is not a thing you've seen, but something you yourself have made out of the dots. If you started with different priors, you'd collect different dots and build a totally different picture—and believe me, people do.

Your (and others') dot collections are smatterings of datapoints out of which, like magic beans, you can grow whatever beanstalk of bias you want. People with different priors have different tastes in datapoints and "ignorant morons", therefore collect different beans, and therefore grow different visions of massive, outrageous bias—and they're all just as angry about it.