In reply to sjc:
In South Africa the Mountain Club has installed metal cages near some crags to put your gear in.
This is to stop thieving from your sack by monkeys. Might work against light fingered humans as well!
You are right, we tend to be very trusting in this country and on balance I think that trust is well placed. However I still think it makes sense to be cautious and aware. For example I don't take my wallet or phone with me when I go cragging, I just take enough money for a drink and a pie afterwards, and leave them at home or if away, locked in the boot of the car.
I or my friends have been robbed more than once at Font - a few years ago notorious for rucksack thieving and car break ins - and when there I tend to keep valuables on me with a light daysack or money belt.
I've also had the car broken into in Spain, twice now, so again don't leave things in it, unless locked in the boot - even that is risky but hopefully deters opportunists.