>>652812When I'm traveling by foot or bike, I occasionally have to crash just off the road long enough to rest and get back out. Sometimes, there just isn't a good place to do that, and I have to stay where I might not be welcome. I always feel guilty about it, but it's unavoidable.
If people are deep in private property and staying for several days or hunting/foraging on private property though, you'd be well justified in crashing their camp. Read: shoot on sight.