To admit you are not happy as a JW is "to bring reproach on Jehovah and his organization," which in the WT world is the worst sin imaginable.
"Jehovah's people are the happiest people on Earth...
...but I'm not happy...
...maybe I'm becoming weak in The Truth...
...I don't want to be seen as weak...
...so I'll put in more hours and auxiliary pioneer this month!"
See how it works?