I don't worry about valuables being stolen because I either leave them at home, lock them in the car, or have them on me in a daypack. If I was that worried about someone stealing my tent and supplies I would not be out by myself camping.
I am more concerned about mentally unstable people who might want to harm me or a bear stealing my food. There really is no place for paranoid thoughts when out alone in the wilderness. It would be a miserable trip for me if I was excessively fearful.
That being said, if I set up my tent in a forest and someone stole it, I'd have my 10 essentials on me and would make it back to the car. The whole time hiking back I'd be kicking myself for being trusting, cussing them out for taking it, figure out that they must have needed it more than me, and by the time I got home I'd have decided which one of the tents I'd been drooling over in the store to get next.
If someone stole my dog however, I'd be tracking down some sorry a** person with a serious case of don't mess with this girl on my mind. ;-) She is not an object that I can
replace at Best Buy or the local sporting goods store. That's my dog on my avatar. We were 8 miles out on a day hike on the AT and she's looking in the pack for some food! Please notice that she is leashed and the poop bags tied to the handle. Responsible pet owner here.