For what it’s worth:
Yes, that’s the thing. A number of naysayers in this thread are assuming that the only criteria for extreme alarm is what he has concretely done. To me, and just as importantly, an equally alarming factor is what he WANTS to do and what he WOULD do if circumstances eventually allow it.
I thought I remembered a post from long ago that said, “There’s no way in hell that pot will be legalized in the next 20 years.” I was a little off:
That said, the post is still aging poorly:
I don’t know the exact parameters, but I really miscalculated how popular THC would become.
Nope, you’re not wrong because, despite the fact that a number of states have legalized marijuana for various purposes, it is still illegal under federal law. 
Right–but even now, in younger generations, weed is more popular than booze (by some measures). Federal legalization will almost certainly push that even further.
What I didn’t count on is the information in the past two decades about “no safe levels of alcohol consumption”: when I wrote the post, there was still a belief that a daily glass of wine was good for you.
There are at least a dozen posts around here I penned with the sentiment that Trump would certainly not be elected again, I believed in the integrity of the American people. Sigh