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this seems like it would increase tribalism and polarization

Indeed. Why engage with ideas on the merits when you can color (literally) your own opinion of them before even reading.

I guess if you just prefer wearing horse blinders?

There's nothing about this that's horse blinders. It's literally a way to highlight riders that you both agree and disagree with. It actually makes it more likely that you're going to engage with the ones you disagree with, because now they have a red orb.

Might as well just have one ambiguous orb, then.

For a further improvement, let the extension set some orbs automatically at random, to encourage discoveries. Then upgrade this to all the orbs.

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