Considering the number of times someone has knocked on my door with information I need (hey, noticed something of yours was on/open/etc.), something I want (this was delivered mistakenly to me, here you go), or offer for assistance (Hey, it's me, a kid from the neighborhood. I'll shovel your driveway for $$), sure.

If you live in an area that regularly has people literally trying to con you door to door, that's an issue with where you live. It's not normal for many people.