Hidden Brain had a pretty good podcast on this https://www.npr.org/2020/08/21/904660038/the-halo-effect-why-its-so-difficult-to-understand-the-past https://www.

Hidden Brain had a pretty good podcast on this https://www.npr.org/2020/08/21/904660038/the-halo-effect-why-its-so-difficult-to-understand-the-past https://www.npr.org/2020/08/21/904660038/the-halo-effect-why... . Link includes a quick summary.