Thank you for sharing the biographer interview.
"Demon mode" must come with risk. Thinking how demon leaders of the past have wrought so much terrible suffering, e.g. Stalin, Hitler, Mao, and so on, one might worry how Musk could magnify the damage wrought by Trump.
Would Musk have any sway over defense policy? As the biographer explained, with Starlink and Ukraine, that can happen. We should worry.
His design-for-manufacture algorithm to reduce costs by eliminating requirements might raise a bunch of red flags. Sure it might be OK as he said if a few rockets blow up. But when will it not ok, e.g. the Challenger disaster, our functioning democracy, our global alliances?