> I wonder, does such a person share a lot of characteristics of his mental state with someone who on the other side of the political spectrum
This sounds like the "horseshoe theory":
"In political science and popular discourse, the horseshoe theory asserts that the far-left and the far-right, rather than being at opposite and opposing ends of a linear political continuum, closely resemble one another, analogous to the way that the opposite ends of a horseshoe are close together."
It's no surprise that "[t]he horseshoe theory has been criticized by those from both ends of the political spectrum who oppose being grouped with those they consider to be their polar opposites [...]" by the way ;)
This sounds like the "horseshoe theory":
"In political science and popular discourse, the horseshoe theory asserts that the far-left and the far-right, rather than being at opposite and opposing ends of a linear political continuum, closely resemble one another, analogous to the way that the opposite ends of a horseshoe are close together."
It's no surprise that "[t]he horseshoe theory has been criticized by those from both ends of the political spectrum who oppose being grouped with those they consider to be their polar opposites [...]" by the way ;)
See https://en.wikipedia.org/wiki/Horseshoe_theory for the full article.