Each to their own. They do what they do. What's the problem?
At the end of the day it's different strokes. How can they be a problem, they're not commiting a crime, they're only a nuisance if you see them as one. Where I used to live they'd call round on a regular basis, handing out magazines etc.
My mum just answered the door, always informed them that she wasn't interested or religious. She's pass a few minutes with them and then they'd go on their way. She never saw it as a problem. Neither do I. I did the same - said I wasn't interested, politely.
Don't know if they're loving but misguided, either. Maybe so. I had a few friends that were raised witnesses. Can't say they were loving. If anything they were wild whenever their parents were out of sight/hearshot.
Maybe they are wrong (about their religion and teachings) but who's to know who is right, which religion really has the truthful answer? None, in my opinion.