Even before I had door cameras, I would just not answer the door if I wasn't expecting someone. Everyone I know would know enough to call or text before coming

Even before I had door cameras, I would just not answer the door if I wasn't expecting someone. Everyone I know would know enough to call or text before coming over, and anyone in an emergency would keep knocking. I've had plenty of obnoxious salespeople and other solicitors, especially religious ones. They even have the nerve to claim that they aren't soliciting because they're not selling anything for money. And none of them have the good sense to accept that they're bothering someone that is obviously not happy that their door was knocked on. Unless I'm already in a really bad mood, I generally start off nice, but I turn serious as soon as they refuse to take the first 'no'. Except for the ones I argue with for a while to waste their time and energy.