Earlier quoted context omitted.
You're right to remind us about the cognitive biases relating to in-groups and out-groups[1], but let's remember that in the context of this thread, the original comment about "idiots" was: "These people are idiots. Bringing their cellphones, recording video of themselves committing felonies and then posting them online." It doesn't seem that the commenter was branding every voter for the opposing candidate an idiot,…
It's a pretty common sentiment I've seen lately even here on HN, for example all of the threads about how amateurish Parler is/was (LOL did you know they're so stupid they didn't know to strip image metadata?), like we told them to go make their own website but then mock them while they learn how to do it. I'm just sick of being mean!
"I'm a newbie web developer and I've never heard of EXIF", and
"It didn't occur to me that I shouldn't have recorded video of myself committing crimes and then posted it on the internet."
> I'm just sick of being mean!
Fair point. And regardless, "these people are idiots" doesn't really help us make sense of what happened, or figure out how to stop people from even wanting to do things like this in the future.