You've been led a little bit astray here. Mastodon as an entity is apolitical and solves the politics problem by allowing administrators to create 'federations'

You've been led a little bit astray here. Mastodon as an entity is apolitical and solves the politics problem by allowing administrators to create 'federations' that can choose to be part of the same network as other federations or not. This means that the network is home to the left, the right, Japanese fetish communities, and whatever else an enterprising admin may have chosen to create. It's more analogous to a mix of twitter and old school BBS's with a bit more connectivity. It's completely up to the admins of each federation how their federation interacts (they get a file permissions like specification) with the rest of the network.