Re: Ambiguity; not in this case.
"in the US you can shoot someone dead for simply stepping onto your property"
Liar. You still need a good reason.
Postmen/delivery drivers have 'implied consent' until you tell them you remove it. If a kid kicks his ball into your yard, you are not legally entitled to shoot them as they come up to your door asking to get it back. If a car breaks down on the road outside your house, you can't just kill the driver for asking to use your telephone.
Just 3 examples of how your statement is wrong, and there are many more.
Christ alive, if someone with your attitude is allowed firearms, it really does prove that the psychological checks they are supposed to carry out don't work.