Fanaticism can often be a normalized phenomenon, and the unwritten recipe suggests that it starts and ends with absolute certainty. If you are always certain about everything, you might just live in an echo chamber, or there might be a lack of ideological diversity among your sources and friends. Only, there is no size limit to this echo chamber as long as there is consensus: and the bigger the chamber the more solidified the fanaticism, and the more solidified the fanaticism the more the outlier will be seen the liar and the fanatic.
— Criss Jami
certaintyconsensusecho-chamber