Some theft is certainly planned, but I suspect most is opportunist. I'm genuinely sorry to those who suffered thefts in LM.
I read on PH that someone had their wallet lifted, probably by an other Brit, at the driver's parade. Not sure if that's the same person that's posted here?
I also read that a group of Brits had stolen one of Aston Martin Racing's golf buggies, driven it to BN and then crashed it, whilst pissed, into someone's new XF - then buggered off! So, it's not the French pikeys that are always the problem.
I'm pleased we've not had anything nicked in the years we've been going, but I always lock my backpack in my car and keep my wallet in my tent, well away from the tent opening.