Apparently orange is purple too.
"In other states, such as Idaho, Montana and Arizona, orange is the color of choice for “No Trespassing” paint.
Can you get shot if you trespass?
Despite what many people may tell you, it’s not legal for landowners to shoot you if you happen to wander past one of these purple markers, however they do have the right to remove you with force if you’re caught trespassing."
For the most part the threat of deadly force is just the teeth that define the ultimate bite in the power of the land owner. I have known many country folk in my life. Every one of them would ask nicely before any brandishing would occur.
But property ownership is a fundamental right in my culture (one that is under threat) and on the outskirts of civilization a man must be prepared to defend what belongs to him.