Most JW's are sincere, kind, and loving. I say most because those that are appointed such as Elder's know full well many things they are "secretly" privy to don't add up yet they continue the charade in order to maintain their position of respectability and power.
Sadly, the longer a JW stays in especially when "new light" is provided, the harder it will be to leave. I've always accepted the "new light" as a progressively way for JW's to fully understand the meaning of certain passages and prophecies. This is not the point of "new light". The point is to correct a mistaken view of the GB by blaming it on Jehovah and thus keeping their roles as spiritual leaders intact.
I'll always maintain a kind and sincere attitude when running across the JW's. It's like Jesus said to Jehovah, "Don't blame them for they do not know what they do."