Wow, I didn't know this effect had a name. I've experienced it so many times.

I've also seen how politicians lie and tell half truths about stuff, where I know the full story like them.

It was in the article...

Shows that it's not safe to assume that a random Besserwisser on HN has read the article. In my defence I did skim through it though.

I consider it the cost of information rather than amnesia.

When I read articles about something that I don't know much about, I usually don't have time to fact-check everything individually if it's not obviously wrong and seems to be plausibly presented, so I use it as a base theory until I receive evidence to the contrary - while knowing that it is likely still full of errors.