They don't see it as being insulting, because "true believers" think in black and white, and the WTS can ONLY wear white hats. They see it as the opposite of insulting. They see it as being very loving.After all, the WTS are the sole earthly representatives of the Sovereign Lord Jehovah, and the only ones annointed and approved to speak for him. Jehovah's four attributes are Justice, Mercy, Love, and ...(anyone else remember the other one-I can't off the top of my head), so he could NEVER make a mistake, and all of his decisions and commands are good. He is perfect. Humans are not (that is why sometimes there have to be corrections in the Watchtower. It's not that God sent the wrong message, or that they are not really the sole representatives of Jehovah, it's just that humans are imperfect and sometimes don't record the message right, or sometimes God sends "new light" to clarify something the brothers wrote down that God didn't think was a written down clearly enough by them).He makes the rules,which he then reveals to the WTS, who feel compelled solely by love for Jehovah and mankind to warn them of the dire results of not listening (not to mention the fact that they don't want all that bloodguilt heaped upon them, which might affect their OWN salvation). Humans are designed to be obedient, and follow their Creator by listening to His representatives here on earth. That would be the "Faithful and Discreet Slave." Anyone else who claims to speak for Jehovah are agents of Satan, deliberately misleading mankind and leading them to eternal death.
Hamster, they are INDOCTRINATED in this belief. They MUST believe it to be accepted in their organisation. They MUST speak against people they consider apostates, as their indoctrination and the WTS demand it.If they were to defend an apostate, they would be shunned. If they were to stay silent, they would be "bloodguilty."
I would consider it odd if they didn't question the whistleblower's motives, because that is how indoctrination works to keep the members obedient, and whistleblowers at bay and ineffective with the JW rank and file. It's a great feedback loop.
My guess is that you are having a hard time understanding this now, because you are outside of that feedback loop. Congratulations!