Why can't we sue the Governing Body for people who are misled into believing that Jehovah will provide for their every need and they end up destitute?
You can, but you have to be able to prove intent to do something illegal, like fraud. There is possibility of course. The Society, by getting people to commit to the rest of their lives to be free employees of a publishing house as salesmen, managers, pressworkers, etc, has a sweet deal. We're talking conspiracy to commit fraud, fraud, RICO, tax-evasion.. lot's of stuff could be proven if you could prove intent, but barring some amazing revelation that no one at the top believes a word of it and that they are just doing this to get free help to get "donations" for their books and magazines. And I dont think that even among the exwitnesses, that there is a consensus of belief that the people at the the top don't believe.
Frankly I think the people at the top are some of the dumbest of all, and yes, I think they believe, so as long as there is freedom of religion, and they are not using religon just for an excuse to do business, then they can and should be able to do much of what they do. Much real blame rests on the hands of those who became witnesses in their adulthood, or who haven't left after knowing better in adulthood. It takes a villiage of idiots to raise an idiotic village.
Edited to add:
What I said was a little harsh. Not all JWs are idiots. Some are quite smart. Their faith is their business (that is not a pun, but it works well as one), and the smart ones have not put all their eggs in one basket, and will not be out living on alms in their sixties.