They should write an open letter to set the public record straight then.
Re: 3 — my argument is that how they went about quitting is the problem rather than quitting per se. That that is my argument is clear from the headline of the piece (“How”) as well as my third bullet point “even if…”
If Weaver is guilty of all the things you are accusing him of, I suggest the staffers write their open letter to Our Revolution with a detailed, evidence-based critique of Weaver and his methods so that there will be pressure to remove/replace him ASAP. I suggest doing that in a way that avoids re-litigating the issue of 501c4, T.V. ad spending, and other areas of disagreement so that you can unite those who can be united against Weaver.