Given that, they have a choice only between excessive caution or recklessness.
Would you rather they acted like the tobacco companies and downplayed known risks, e.g. all the times LLM output got in the news already for dangerously bad advice, sychophantic encouragement of mental health issues, finding previously unknown security vulnerabilities etc.?
Well, they've done that too, if we're looking for reasons to doubt their sincere concern about it.
It all sounds pretty accurate and reasonable to me if you watch it.
So it doesn't really matter what he thinks
Truman was totally in the dark until April 1945 by which time the bulk of the PoC and weapons prep work was done and the project was running fully independently w/o POTUS involvement.
That is not how it works. It is not “splitered”, there is no divided attention.