You....you don't think Brexit was a bad thing?????
You may not agree, but it shouldn't be mindblowing that reasonable people hold this view.
As an American you have presumably been affected by eg GDPR and should therefore recognise this is not true.
Leaving the EU means we have removed ourselves from that decision making process. We will still be affected by any decisions they make.
For some reason people read a couple of articles and become experts on really complicated, multi faceted, non deterministic systems and decide to expound their opinions on those around them.