FB doesn't optimize for enriching you, or even for agreeing with you - it's optimized for engaging you. If a barely-lucid rant comming out of a political faction you hate will mindworm you, that's what they'll show you.

Apparently their optimization strategy failed to engage in this instance.

>Instead of using websites that show the same thing for everyone.

But that's a good thing. It sounds like you WANT to be ensconced in a political bubble. People splitting off into echo chambers is a major source of the problems we see today.