Because musk/tesla have a... questionable record with truth and safety, and all these guys claims were about said transparency/safety? Why do you trust musk/tesla over tripp?
A company and its CEO have way more to lose in getting caught in a lie, which puts a slight preference towards believing them in uncorroborated he-said-she-saids like this.
Also: "innocent until proven guilty" is a phrase that seems to be eroding away, which is a terrible, terrible thing. The real move here is not to believe either party until you have irrefutable evidence; there is likely some amount of wrongdoing on both sides but none of us are in a position to make judgement calls without that information.