> AFAICT there are no major issues that should have caused this.
Populism and a perception that a more globally-connected world is concentrating the benefits of growth into the assets and control of a handful of individuals instead of "a rising tide lifting all boats." Also, the message that some politicians have been using ("trade agreements are evil!" "immigration is bad!" "the EU is making us abuse you!") has taken hold and people are pushing back against the perceived wrongs.
(I intentionally made no judgment call on the accuracy of these perceptions.)
Populism and a perception that a more globally-connected world is concentrating the benefits of growth into the assets and control of a handful of individuals instead of "a rising tide lifting all boats." Also, the message that some politicians have been using ("trade agreements are evil!" "immigration is bad!" "the EU is making us abuse you!") has taken hold and people are pushing back against the perceived wrongs.
(I intentionally made no judgment call on the accuracy of these perceptions.)