#1 Yes, If it's not your or public land you are trespassing. It is your obligation to know land boundaries.
#2 I'm talking here about shotguns/rifles for hunting, not side arm for protection, it was clear there were hunting with decoys and stuff, as long as you have valid pistol permit no ECO will give you grief, other than that you will have some splainin' to do.
#3 Destroying/stealing (or attempting) private property, the cam in this case.
Good job OP for following through