Here is a pic of my son from when he was about 16 years old. We were fishing the Salmon River (Bovines section) when he hooked this fish. I had our spinning rods set up with probably 6 lb. leader material, and the drags were set relatively loose to help prevent break offs during the initial strike and run. I would typically carefully adjust the drag during the fight, if needed, to prevent a fish from spooling me.
When my son hooked this fresh, fall fish, we both got pretty excited and made mistakes. I stepped out of the water to grab the net and headed downstream along the bank in hopes of catching up with the fish. This fish was headed back to the lake in a hurry, and my son never thought to carefully tighten the drag a bit to slow it down, so he just headed downstream in the river with it to try to keep up. In doing so, he waded in front of, I'm guessing, a dozen other anglers of all stripes who graciously reeled in their lines, all while cheering him on and offering their advice to help land the fish. The pic is proof that it worked, and, trust me, there is a huge smile on his face.
Obviously, nobody expects solitude during the fall steelhead run on the Salmon River. But folks there might also not expect to have another inexperienced fisherman blast down through the river right in front of them, either. But, every one of those "snaggers" and "flossers" seemed more than happy to participate in this rodeo and help out where they could.
I wouldn't condone nor have allowed my son or myself to behave this way on a trout stream, but I also wouldn't require others to totally disappear out of sight or leave because I happened to arrive at a stretch of public water two minutes before they did, either. Who knows why they didn't arrive before you did. Maybe they are dealing with health issues. Maybe they needed to help take care of an aging parent that morning before fishing. Perhaps they had to get their child off to school before leaving for the stream. Maybe they had a three hour drive and only get a chance to fish that stream once or twice per year.
As was said here earlier, it's just fishing.
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