I think there is a large element of bravado here, 'no one could get in my van without my knowing', the scumbags that do this know people arent on the whole as vigilant as they think they are. In our village we had a three day folk festival, this ran for three years, on the third year the campers were turned over, big bruiser HA type bikers were robbed in their tents as they slept, one even had his wallet removed from his jeans pocket as he slept! i think blaming these thefts on gassing is a way of making up for the fact you have been a victim of these scum, i have been a victim of theft, it left me feeling emasculated, i'd have loved to caught them in the act, but because i didnt i wanted to blame everyone but myself for what happened.
the clincher over the gassing story is that there have been NO reported deaths, in the next village to me there is a beautiful house, way out of my range, the owner is a world renowned peadiatric anaesthetist, he earns more per year than i will over my working life, his skill is knowing how to anaethetise the most delicate amongst us, and make sure they wake up afterwards! But of course the criminal lowlives out there are so much better qualified!!!!
On another thread on here, various posters have called others irresponsible for running with their fridges on gas, the potential for disaster when in a filling station with the pilot light burning is nothing compared to being parked with your gas fridge running, while enough easy start is sprayed into your van to knock you out!!!!!!