If you run a community, you need consistency. Members need to know where the boundaries are in regards to how you can act and what is/isn't acceptable.
Twitter doesn't really do this well. If you agree with the staff political stances, you can basically get away with anything. If you're popular enough (or a large company), you can often get away with things that would get a less popular user banned.
For example, contrast what happens when a left wing user breaks the rules and attacks people and what happens when a right wing one does it. It seems like the former will get punished a lot less harshly for the same offence.
Twitter needs to stop this, and enforce the rules for everyone in every situation.