Yea I can't imagine just opening my door, ever. I think some people become too comfortable and just open it out of habit. Assuming it will always be a friendly face on the other side.
I also can't imagine anyone going through the junk and trash on garbage day here. I'm in the country, if someone stops and starts rummaging through the trash, they are going to get confronted really fast.
That's one thing I like about living in the country. Anyone pulls in my driveway and my motion detectors go off. If they walk within 50yds of the house at night the motion sensing lights come on and trigger my chime connected to the driveway sensors. There's no reason for anyone to be around my place unless I know they are coming.
I have had people lost come by very rarely, I know if they are out there. As long as they are cool so am I, but it is no place to be dicking around. Knock on wood, I haven't had any problems yet. My red nosed pit is a deterrent too, come up on my porch and you'll always see her head looking out right at you...