This whole thing was so, SO poorly executed, but the independent people on the board were gathered specifically to prioritize humanity & AI safety over OpenAI. It sounds like Sam forgot just that when he criticized Helen for her research (given how many people were posting ways to "get around" ChatGPT's guardrails, she probably had some firm grounds to stand on).
Yes, Sam made LLMs mainstream and is the face of AI, but if the board believes that that course of action could destroy humanity it's literally the board's mission to stop it — whether that means destroying OpenAI or not.
What this really shows us is that this "for-profit wrapper around a non-profit" shenanigans was doomed to fail in the first place. I don't think either side is purely in the wrong here, but they're two sides of an incredibly badly thought-of charter.