I'm not going to tell you that I never lock my bikes up, even at a campground! But I use a lightweight cable lock. One night in downpouring rain, I was asleep, when I woke up due to hearing whispering, yeah, even in downpouring rain pounding on my tent and all over outside, my brain picks out a sound that shouldn't be there, in this case, two guys whispering, I then peeked out of the tent to see one of the guys walk over to the bike that I locked to the bench, and he then whispered to the other guy that it was locked, and they walked away. My tent was the only tent in the primitive campsite area, they had to come down from a non-primitive area, why were they walking around at 2 am in a heavy downpour? Obviously, they were thinking that the noise of the rain would disguise their presence, and had I not locked it, and not woken up, which most people would have never woken up, I would have woken up that morning to a missing bike.
Going into a small store or a fast food place where I can see the bike I'm not too concerned, but if I decide to leave the bike and go fishing or walking some trails where I can't see the bike for hours, or at night at a campground, sorry, call me paranoid, but I'll lock it. I can't guarantee that my brain will always wake me like that, so far it always has, but I'm not going to trust that to happen all the time. So while I did wake up during that incident, I was glad I locked it. This event occurred when I was 68 years old, 2 years ago, those two guys were late teens to middle 20s, I may have had extensive martial arts training, but that was a long time ago, and now I'm older, and two younger stronger more energetic guys maybe with knives or even a gun could be a challenge that I would rather avoid if possible, so by me locking the bike it prevented that confrontation.
