Wow, great article. This completely explains why travel (not the tourist kind, the serious kind) tends to make one more tolerant: you encounter people who clearly have very different values and beliefs, but who are nevertheless amazing human beings. It’s a powerful force for developing a more complete theory of mind.
I really liked the article, but I wonder how many people can read it and think: "hmm, indeed, I don't seem to have that capacity" rather than "hmm, indeed, I've seen others not be able to do this"? I know I certainly felt more of the latter, with the possible exception of indeed sometimes still ascribing nefarious intentions rather than a different world view to people I disagree with - but even then, I only do so with the caveat of "well, at least I'm aware of and trying to combat those thoughts".
This one deserves a read. It also shines the light on a rabbit hole which seems to go deeeep.