I think their motives are nuanced.
Their raison d'etre is to protect 'Jehovah's organisation'. That justifies anything that needs to be done for the greater good. In the process of course they protect themselves personally from public shame but the fiction of the 'F&DS' allows them to detach themselves from their own liability.
In the process they have behaved appallingly and are responsible for thousands of wasted and broken lives.
Individual JWs are not admirable IMO. Anybody who prays daily for the immediate annihilation of 99.99% of the world's population so that they can inherit a dystopian New World is not a moral person. Anybody who can let their child die for want of a blood transfusion is not moral. Anybody who can shun their former friends and family for a thought crime is not a great person.