It's not that simple because imagine that you have a friend that's really cool but you can't talk with him about cars because he has unpopular opinions (or dumb

It's not that simple because imagine that you have a friend that's really cool but you can't talk with him about cars because he has unpopular opinions (or dumb) but really likes to argue for them. If you have that friend on FB then, because he sometimes posts things about cars and it gets heated, that's what FB like try for you to engage with. FB seeks and promotes "engagement" over "quality of experience" so it will always try to make you anger (it leads to more engagement) than to have a fulling experience. If the algorithm can only work with chill people and very alike... it will still try to find what divides and "engages" that group of people.