Yes psychology is involved, but your reference to a response being ‘unlocked’ is a good observation which should be a catalyst to look more broadly than psychology. To understand the Trump, Brexit, etc phenomina requires a sociological look. Individuals need to be understood in a sociological sense as well as a psychological sense. This type of effect should be expected to be more prominant in times of fundamental change and fast change which we are in today.
I recently saw an academic role I’ve never heard of which may be useful for looking at this sociological, or cultural, angle: sociocutural anthropologist
What do you think?