I would defend the need for people of faith to share their beliefs by any means possible if it is true. My beef is that are spending their lives preaching a false teaching that enslaves vs saves people. As well, even if true, door-to-door is one of the least effective methods (thx to JWs ruining it for everyone; in Britian/America, the home is the castle and we do not want intrusions; in other countries, people invite anyone in to be hospitable, even if there is no interest in the message). Our mandate is to share and God draws/converts. If JWs had the Holy Spirit, they would see much more growth given the hours they put in. With the Spirit, Christian churches are growing explosively worldwide. Many Christians have not seen many converts, but the message is true. Even if a Mormon missionary has fruit, the message is still false (Muslims also convert/attract people and other Muslims become Christians, etc.). So, we should share our faith even if no one is actually converted. The gospel can be freely received or rejected and God does not even force conversion.