Some of the nicest people I have ever met were JW trying to convert me. I remember eating in a mall food court, and these two well dressed younger guys kept on looking at me (I thought I may have known them from school). They sat down and gave me their hard sell, but to their credit, they sat and answered all of my questions about their religion, and were very respectful given that I am an ardent agnostic who was extremely critical at times(spiritual, but dislike most forms of organized religion).
My take away was that they were well intentioned people who genuinely believed conversion was the only path to salvation. They also do alot of volunteer work for the elderly in the community (delivering groceries, minor repairs etc.). If only all religious nut jobs would be so considerate when attempting to convert others.