[watwut]

1.) I have seen people claim their subjective opinions are "fact" just because they expressed them authoritatively and with conviction. It is not rare, it is super frequent.

And it is frequent especially in tech and adjacent communities that frame themselves as rational or scientific.

2.) With history in particular, selecting which facts you use makes massive difference. You can tell technically truth statements, leave out context and end up with a massive lie about what happened. You can switch victim and aggressor, make assholes into heroes and so on.

Same exact effect is in economy and other fields, but with history it is super easily apparent.