Actually if you look at the human side of potential incidents, many behaviours and belief are a large part of the problem:
I left my laptop on a table in the hotel lobby and when I came back from my meeting 2 hours later it was missing?
I've have left my laptop on the train, can you got to lost property at the end of the line and see if they have it?
I've have my laptop stolen. Where was it at the time? In my car. You left you laptop on view in your car? I left my car parked up in a public car park unlocked and the thieves took my car.