he seems intent on sprinkling the word "extremist" through the article and never quite explains how those who believe they are the only true believers are extremists.
She makes it very clear that extremism stems from the *belief* that God has given *your* human religious leader a revelation that you and have the only true religion - that those who do not identify as belonging to your belief system and live by your " revealed" standards are inferior, "less than' human beings deserving of death and destruction. As she says, "any religion that denies the *value* and humanity of others is extremist".
Witnesses absolutely deny the value of others and their "othering" behaviour in any other context but religion would be considered highly offensive and downright illegal in many instances.
Their belief's lead to behaviours and although at present it is only dangerous to themselves, think blood doctrine and suicide due to shunning and sexuality, that definitely places them squarely in the extremist category imho.