Unless we know the whole story it's hard to judge all of this. If he was hanging No Trespassing signs on someone else then he was trespassing. As far as the rest goes, I've had deer poached off my land, fences cut, 4 wheelers run through crops. While I have just warned trespassers and let them go, eventually you get feed up and just decide to get the law involved. I understand that part. When I'm on my land I'm armed, I don't threaten anyone, but then I won't be threatened either. If you don't own the land, get permission, know the boundries, be sure of them, if in doubt don't go there.