I'm with Daniel, were you an evil person when you were a JW. It's very easy to suggest that other people are evil, the reality is that there are shades of grey. It is very easy to attribute the actions of others to malice and to attribute the actions of ourselves to mistake or misunderstanding. With the right set of circumstances any JW could choose to leave. Whilst I don't deny that individual JWs can do things that are evil that doesn't mean that they all are.
This is a very different topic to the question of the WBTS or the governing body being a force for evil.