Hitler (hypothetically, not I recreated a I discussing whether or not this was his belief) genuinely believing Jews were a dangerous threat that could be dealt with by no means short of extermination does not reduce the degree to which his action on that belief would rightly be seen as alarming.
> If you recall, he said something along the lines of climate change being a Chinese fairy tale.
OTOH, I also remember his official campaign staff and unofficial campaign surrogates repeatedly saying that his statements on most policy issues should not be taken literally. A position that Co tinted to be uswd, in various forms, by his White House staff (e.g., in claiming that his statements explicitly referencing wiretapping are not literally about wiretapping but other activities.)
If one is alarmed at Trump's explicit statements, the response is "calm down, stop taking him literally".
If one is later alarmed that Trump acts in accord with such a statement, the response is "calm down, he's just doing what he explicitly said."
Aside from the obvious game being played here, doing what you previously said doesn't make an action less alarming, in much the same way that acting in accord with your own genuine (if unjustified) belief does not.