I' ve been hunting public land 20+ years and have only had something similar happen 1-2 times max. Most recent was 5-6 years ago in the Francis Marion Forest. I lived 25 miles from where a buddy and I was hunting but we took seperate trucks and parked at a pull in. Sorta thought 2 trucks parked there would discourage others from walking in on us.
Around about 10:00 am I see this dude coming thru the woods, the only way into this area was right by our trucks. Here he comes, closer....., closer........, I ease my 30-06 over and fire a round off to the side and that sucker damn near crapped his pants. He looked up at me in my climber and I put a finger to my lips and said," Shhhhhhhhh" He got all pissed off and left the way he came.
I was telling my buddy about it later that morning and he tells me he saw the same dude before he got to me. My buddy was in his climber when the dude comes in on him and proceeds to take a dump about 40 yards from my buddy' s stand. Joe yells at him to get the h*ll out of there, instead of heading back out to the road he comes on into my stand and I.........