Teh friendliness is good, but I think you misunderstand about the diligence part. They are driven to go door-to-door. The JWs even have to report to their local congregation how much time they spend doing it each month. And they don’t do any of the works of mercy that Catholics do. They don’t give to charity. They limit family size so they can spend more time going door-to-door. They don’t operate hospitals or schools or food banks, etc.
Oh, that’s very sad. I’ll have to offer them parsley and oregano the next time they come (parsley is overrunning my front flowerbeds), to make up for their not having babies.