I would say for me, the tyrannical way they protect their history to make sure you don't know the real truth about it. And if you do and say something and tell others, then you can get disfellowshipped for it. That's a crazy sin in itself, is it not?
And yes, as another poster has said, the way they changed the Bible, they put Jehovah in the Greek scriptures where the word Lord is, just because they think it belongs there, that's another crazy one. The Greek didn't have Jehovah in it, if it did then put it in there, but it doesn't, so why go beyond the things written?
Another thing is their flip flop doctrines that they change depending on what season it is. Like blood and blood fractions and organ transplants. It all depends who is in control at the time, not God's spirit, that's really obvious.