Maybe it's not "groupthink reflexive cynicism" if you feel the need to address the obvious conflict of interest of the AI leaders in each of your paragraphs. Why did they launch this coordinated AI safety campaign, starting with Jacob Coxon's tweet?
Consider the massive power and wealth differentials these companies stand to gain if they "win".
When the other participants have given up all reason and reasonable bounds on power, you'd do well to abandon any pretense of generous interpretation. Now is the time for critical analysis, not faith in the inherent "goodness" of someone whose entire job is presently to make as much money as possible by disrupting literally the entire white collar industry and who stands to gain much more than you or I do, and let's not forget, this outstanding success would never have happened without our work.
Keep in mind this is not a person who thought "wow, this is an existential threat, I'd better not contribute to building this". If anything Dario's past alarm ringing only proves that he's not really doing this in good faith. Otherwise he would have stopped a long time ago. The most generous interpretation of his behavior is that he literally thinks only anthropic is responsible and smart enough to build and control this stuff which...yeah, that should be pretty telling (esp. when you consider their recent security mishaps).
Now, someone is going to say but the investors and obligation to be first; and I would say exactly. The cynicism is well deserved and I think people are tired of what could be suggested is your group think take often called the status quo.
Why do you think so?
First, Dario thinks that OpenAI will continue racing even if he stops, so there is, by his values, no point in stopping. Do you disagree with this, and think he should stop anyway?
Second, what's your take on, for example, Jacob Coxon, who did resign from Anthropic a few days ago after realizing they aren't being responsible? Do you agree that he, at least, does believe in AI risk?
That is to say, I've been places where I tried really hard within teams to change certain things that I thought were broken only to find out that what the leadership said and how they acted were divorced from my and many others experiences. And so I did leave in those instances (and please read this not as I didn't get my way but total dysfunction behind beautiful facades).
So, I do think if he really felt as he felt he'd do something different than ultimately yelling "somebody stop me!".