Just look at posts on this site and JWfacts and examine Randy Watter's Freeminds literature (even going back to when it was Bethel Ministries).
Plenty of books, blogs, and videos are available challenging WT theology from every conceivable viewpoint.
There's the UN documentation and the Australia Royal Commission.
Even without any of that, the evidence is there. Ex-elder Leonard Chretien said, "The Watchtower's worst enemy is its own literature." He was referring mainly to their false prophecies and doctrinal flip-flops and cover-ups.
But the main question is: Prove to whom? To JWs themselves?
You can only prove something to someone who is willing to look at the truth about "the truth."
Some JWs meet that description, but many, many, many do not.