The difference for me comes down to the relative power both men had. If the US had been the sole hyperpower on the planet, Jackson may well have out-Hitlered Hitler. If Trump’s administration wasn’t actively engaged in sabotaging his deranged orders to attack Venezuela and Iran, we’d probably still be at war. Trump exercised authority over 300M people and has, probably for the remainder of our lifetimes, permanently altered politics in the US and around the world, while Jackson’s ability, monster that he was, was constrained that the US was not a significant world power at the time.
The difference for me comes down to the relative power both men had. If the US had been the sole hyperpower on the planet, Jackson may well have out-Hitlered Hitler. If Trump’s administration wasn’t actively engaged in sabotaging his deranged orders to attack Venezuela and Iran, we’d probably still be at war. Trump exercised authority over 300M people and has, probably for the remainder of our lifetimes, permanently altered politics in the US and around the world, while Jackson’s ability, monster that he was, was constrained that the US was not a significant world power at the time.