No, we really don’t need to question that. The main reason we do need to ask the question is that Bitcoin is currently effective at preventing governments from

No, we really don’t need to question that. The main reason we do need to ask the question is that Bitcoin is currently effective at preventing governments from blocking Bitcoin transactions. Even if financial laws exist for a good reason, they don't supercede the "natural laws" of cryptography that determine which actions are possible. So the question isn't whether Facebook should have the power to do X. The question is whether Facebook should be allowed to do X, given that Bitcoin is already permitted to do so.