I agree. If less people had the "Old West" mentality, thinking it's necessary to have a gun with you at all times, these situations wouldn't have the potential to get so bad. I'm referring to both landowners and folks using the rivers here.
Not to get off topic, but guns are for hunting, or for self defense in the most extreme of circumstances. They're not something that you ought to be carrying with you all the time "just in case" , or even to threaten someone off you're property if they are trespassing. In truth, though it's wrong and I wouldn't do it now, who among us hasn't trespassed sometime in the past when we were young, rabbit hunting, fishing, or just hiking around? A landowner with carrying a gun and a trigger-happy attitude is a good way for minor situations to get out of hand quickly and unnecessarily.