I'll throw my hat in the ring and say yes to both questions, under the circumstances.
> ignorantly bumbling his way through economic, trade, and foreign policy
I disagree with this characterization, but can certainly understand how someone could come to this conclusion.
> Put another way: it just seems unlikely to me that all the "burn it to the ground" supporters expected or are happy with the fact that burning it all down also causes them more suffering, too; more suffering than the establishment has been hit with. And yet, here we are.
I suspect the way they evaluate the situation is dramatically different than yours. There are a handful of people who are actually looking into what's behind the seemingly paradoxical (and coordinated) behavior of a large number of people around the world rather than just wagging their finger, but unfortunately hardly anyone seems interested in what they've found.
One such person is Jonathan Haidt:
https://en.wikipedia.org/wiki/Jonathan_Haidt
http://people.stern.nyu.edu/jhaidt/home.html
https://www.edge.org/conversation/jonathan_haidt-what-makes-...
https://www.youtube.com/results?search_query=jonathan+haidt
Two others I'd recommend looking into are:
Mark Blyth
https://en.wikipedia.org/wiki/Mark_Blyth
https://www.youtube.com/watch?v=KGuaoARJYU0 Global Trumpism and the Future of the Global Economy
https://www.youtube.com/results?search_query=Mark+Blyth
Thomas Frank
https://en.wikipedia.org/wiki/Thomas_Frank
https://www.tcfrank.com/essays.php
https://www.youtube.com/results?search_query=Thomas+Frank+po...