Exactly! Frankly I'd be more worried about riding in UK than in France for thefts....
Tbh. Anywhere I go, I'm paranoid about the bike.
If I'm camping, I have a MotoTent style tent and the bike is in with me.
If I'm stopped somewhere, I'll stop where other bikers gather, safety in numbers?
Else I'll try and keep it within sight if that's at all possible.
If I'm off the beaten track (sight seeing in the middle of nowhere) I'll worry a bit less.
Obviously, if they take the bike, that's one huge headache.
The other issue is if you catch them in the act (I have done so once) the damage to the bike is (or could be) already done.
Broken steering lock and an unrideable bike, then the headache of getting the thing fixed.
It's a bit of a shame that you have to worry about your expensive pride and joy for the sake of some scallywags, who then dictate, to some level, where you (plan to) ride