It's a clear case of censorship.

In censorsing they might have amplified the story, but this amplification only occurred after the matter/case was decided. That is too late.

> If you decentralize you will end up with a media for each particular group, and you will have less engagement as you are only discussing with people you agree with.

This already happens with centralization, as the OP raised. Multiple groups at least offers the choice.

I actually think FB knows what they are doing.

Their censorship provokes and manipulates people to engage more with their platform.