Many of you may remember the July, 2011 study edition Watchtower magazine which stated that, "Apostates are mentally diseased" ( http://wol.jw.org/en/wol/d/r1/lp-e/2011524?q=mentally+diseased&p=par ). To Jehovah's witnesses, anyone who leaves "the truth" is an apostate. The funny thing is that logically, anyone who teaches false doctrines is also an apostate.
According to the Watchtower, anyone who listens to false teachers also classify as apostates (See http://wol.jw.org/en/wol/d/r1/lp-e/1200000309?q=false+teachers&p=par ). Now consider, the false doctrine below which has been taught for many years by Watchtower:
"...that some who saw the events of 1914 will also see the complete destruction of the present wicked world; that lovers of righteousness will survive into a cleansed earth." (Reasoning from the scriptures - http://wol.jw.org/en/wol/d/r1/lp-e/1101989239 )
After 102 years, the end is nowhere in sight and so the doctrine has been changed to the overlapping generation doctrine; one of the dumbest things I have ever heard.(https://www.jehovahs-witness.com/topic/5147536702570496/overlapping-generation-doctrine-epitome-stupidity )
There are countless other predictions and doctrines which have proven to be false. Hence, we can rightfully say that Watchtower is a false teacher. Since anyone who follows a follows a false teacher is an apostate, then anyone who follows Watchtower's teachings is an apostate. And yes, according to Watchtower, Jehovah's Witnesses are apostates. By logical deduction we can conclude that Jehovah's Witnesses "are mentally diseased" - Straight from the horses mouth.