In 20+ years I've never worked with or seen a " power crazed Captain" .
But those with huge egos bordering on something similar (esp. away from the ac). I have... infrequently but a few individuals come to mind.
From the videos it seems the Captain never left his seat - surprised me - if I heard shouting and screaming from the cabin at the gate I don't think I would act the same away.
I take FULL command AND resposebility off that aircraft , the safety and security if off it and all souls on it.
Absolutely.