This thinking feels off for this context.
First, there is a counterexample to your point, or a class of counterexamples: scenarios where the company believes the harm to mankind could propagate to harm their ability to sell to mankind.
Which is interesting, of course, considering the “AI may destroy humanity” arguments this topic is centered on are prototypical members of this category.
To be fair, one could argue this counterexample is not actually one, but rather a degenerate case where the good of the shareholders and humanity collapse and converge - in either case, though, the implication here is the same.
It could certainly be the case they are playing these concerns up for more effective use as tactics in unrelated corporate strategies. But failing to consider the possibility of genuine concern being behind this behavior is childish.
If they wanted to be taken seriously about their desire to help humanity not just themselves they would be talking about universal healthcare, actionable plans for UBI (or whatever they think would be how people retain agency and dignity post-work), only building sustainable net-zero data centers...
But no. I see this comment come up again and again and it's really the childish view to hold. Their proximity to wealth and potential future wealth is warping their thinking.