I believe that Facebook, structurally, should not exist. I don't believe that it's good for society to have corporations that are this large and this powerful.
I also believe that every association of citizens should have civil liberties. I have no desire or plans to become Facebook, but I want the freedom to make much smaller companies (or collectives, or charitable organizations, or whatever) and have the discretion to associate with whomever I want. If that right is taken away from Facebook, I am harmed.
If the ability to become Facebook-scale is taken away from Facebook, I am not harmed, because I have no interest in doing so. So that's what I advocate.
(If you search through my comment history, you can see this is not a new belief for me, e.g., https://news.ycombinator.com/item?id=19338090 from two years ago agreeing unironically with Paul Graham's strawman suggestion that Google should not exist, or https://news.ycombinator.com/item?id=24797482 from three months ago arguing in favor of Elizabeth Warren's proposal, and motivation, to break up Big Tech in a specific way following specific principles.)
If your side wants power more than you want to stick to your expressed ideals, go ahead, but don't drag me down to your level. My side's ideals look like an opportunistic and self-contradictory version of laissez-faire libertarianism simply because our position is not laissez-faire libertarianism at all.