How do you even challenge a theocracy, whose adherents believe they're right and can deploy any amount of violence or legal loopholes? Nobody can fix "impaired

How do you even challenge a theocracy, whose adherents believe they're right and can deploy any amount of violence or legal loopholes? Nobody can fix "impaired thinking" of a person who firmly believes they're in the right, no matter the logic errors or negative consequences you bring. Self-righteousness is much worse than faulty thinking. Unfortunately for everyone involved morality is easily absolved, abdicated and deferred to authority, which requires no moral reasoning nor logic. Religions tend to enforce such authoritarian approach - be it a holy text, guru, ruler/head or even social convention. Questions are ultimately forbidden, branded as sin or heresy if they pass some arbitrary boundary.