I don't think Jehova's Witnesses are unique in a belief that their God will punish non-believers. I dislike people knocking on my door to discuss religion and generally dislike evangelising. What I find worse is that every state school in the country (with a few exceptions for specifically Jewish schools) has to have acts of Christian worship because that is the majority religion in the country. I would prefer people knocking on my door and leaving, to my children being indoctrinated daily in school. If I want my children indoctrinated I shall arrange it for myself.
The singling out of any religion and describing them as 'dangerous idiots' is offensive to me (not to mention the title of this thread). We should tolerate religious criticism, but we must also tolerate other peoples' religions, too often people feel they have the right to do the former without the duty of the latter.