Politics in the age of Trump is also all about ignorance.
Not true. You will find many beholden to a group and thus their doctrine feel virtuous when confronted with facts.
A fanatical football fan for example who supports "The best team ever", disregarding any stats. A soldier will kill against his base instincts and morality. Both examples beholden to a group and it's doctrine.
Indoctrination retards/ restricts the mind, making it defend the doctrine/ group against all reason and logic. Sure, religions are the masters of the indoctrination process, but they don't have a monopoly on it.