I just don't want any unsolicited anything coming to my front door, period.
If someone comes to my front door, it better be a friend or someone I'm expecting.
Otherwise, my home is my castle. If I'm not expecting a doorbell to ring, I could be on the phone, sleeping, cooking, eating, watching something, working out, playing a game, reading, in the groove with a bit of creative work, or, ah, enjoying the company of a female friend. I do not want to be interrupted in any of those. Nor do I want to have to "dress appropriately" to answer the door...and that includes finding a small-of-back holster and something to be in it, if it was even something I'd open the door for.
Thankfully, that attitude, a sort of healthy suspicion, seems to be the New England traditional norm. If I don't know you, what business do you have trying to gain access to my home, my private sanctum?