[Volscio]

In theory this is true if everyone is being a well-intentioned actor but anonymity can be used to distort a broader agenda into an appealing message; see obscured-funded lobbying campaigns.

Also context is important for whatever one says, and a statement hanging on its own is rarely very convincing. It can be a red flag (whistleblowing) and it can be inspiring (famous quotations) but usually an argument is stronger as a result of the context from which it came (a culture, a person's stature, reputation, etc.).

That all said, I think we need to have anonymity, pseudonymity, and also verified identity. If we choose to share across those boundaries (sharing Facebook details with another service, as an example) then we have to deal with and accept the drawbacks. We can't expect to have isolated identities exactly the way we want them given that that kind of system would be a quagmire for developers to build...