In most states it is considered an undue hazard. You could take out a rider on it for extra cost.
We live in a litigious society, often awards and guilt or innocence is determined by a jury and maybe more than a few, don't like rednecks or trailer trash and have a broad definition of such....
Some states like Texas provide protection for some activities such as someone wanders onto your property and gets into the pasture with a bull, gets mauled...dumb right? But, in many states you could lose in court because you did not warn of the inherent risks involved with farm animals at the point the person entered the fence....
Even with our laws here, I have to post signs in certain areas, to get the legal protection. Like this.
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If I don't post it in the right places, I could be sued and my insurance company liable. They exist to stay in business and make money, so if something is an increased risk, they are not going to cover it in a basic policy.
People think Texas is the wild west, and you can shoot someone just for trespassing. Nope: that is called murder. I have to notify them of their error, ask them to leave. If they refuse peacefully, I have to call the police or game warden. Now, if they actively threaten me, my property (such as setting a fire) or livestock, then, I have the right to draw my firearm...warning shots here (Felony), and in many states, are also illegal.
There is a difference made between Trespass and CRIMINAL trespass.