Specifically, let's say you support belief A, and I want to add a whole bunch of facts that support belief B. You're still the gatekeeper to decide whether I get to be a contributor. There's no way for someone to know that you're going to approve equally-qualified contributors on different sides of an issue, so they're always going to wonder whether there are voices or facts being omitted.
(But if that's just the plan for beta, that's fine.)