I can understand people's feeling of utter betrayal.
I was lied to when I studied - I think they must have spent years trying to put on a good act to continue trying to fool me. While I didn't know much it worked but I'm a helpful soul and got the impression they appreciated my help. So I did all the stand in talks, properly, you know using the scriptures and making the right points. What I didn't realise was, they didn't like this. Not really. But in my helpfulness (doing these talks) I saw through the false teachings. So I blew the whistle. Nice and loud. Again, I thought I was helping them and the false doctrine simply originated with some fuddled headed chap at HQ who'd got his scriptures twiddled.
But no.
So in the end (having given them 14 years) I disfellowshipped the Governing Body because I had evidence they were ignoring my expressions of deep concern and I could see the horrendous damage they were doing on so many levels. All sorts of things that the Bible condemns. Yes, they threw me shortly after, but by then I had already told them they'd been disfellowshipped and done my best to make sure I had informed the congregations far and wide.
Happily this has had a good effect on many locally and encouraged them to leave without causing them the terrible psychological damage that has happened to others.