That requires me to believe that some thief, having cased my house and figuring out that there are easy pickings is going to leave a sign for another thief to help him or herself.
Okay, let me break down the sequence of events. People watch your house and your paterns, when you leave, when you come back. They leave a fairly obviouse mark when you have left, such as a twig in the key hole of your front door, so that if you come back before the time that they want to break in, they know whether you are home or not, because you'd obviously remove it.
When the dead of night rolls around when it's safer for them to break in they can see that the twig is still there and that you are not sleeping soundly in your bed and they can break in at their leisure. These are criminals that plan ahead, yes, some of them are capable of doing that.
When I was moving into my house and we came to check on it the first night there was a chips packet stuck in the fence at eye level. It did not blow in there, it wasn't some pedantic kid, it was right next to the gate. We removed it and our valuable belongings. There was no break in that night, but on a later night. We knew there was some one watching our coming and going so we were not too inconvenienced.
If you really want to take this obviuosly over elaborate e- mail that sounds a lot like the talks we'd get in high school about drugs from police as pure and utter fiction then be my guest. No one likes to think that there are people who make it their job to rip you off, but I've taken it as my responsibility to not let bad things happen to me and I don't like to think of that as paranoia.
If you go and live in a safe country, you'll realise from the massive contrast that we're pretty damn vigilant all the time
It takes courage to live here, like it or not. Crimnals are slippery slippery people, but also pretty over confidant and the good part is they can get caught out by their utter gall. I just think people should not rely on the bizarre concept of "right" and "wrong" in such an instance and work from the far more responsible place of "what are they willing to do to get my stuff". It takes courage to stand up to thieves, I've had to do it myself. It's scary as hell, but it's an act of compassion in my eyes. To prevent some one from commiting a crime is a sign that you care about thieves too.