Always identify the target prior to any shooting. Also, was the hiker off trail or was the shooting on the trail? Why would any hunter set up so close to a hiking trail? I get using it to get to your setup or blind, but one shouldn't be close to a human trail at all.
It was an accident. Maybe the shooter wasn’t careful, maybe the hiker didn’t know the rules. But it’s just really sad for both parties.
Yes, there were obviously errors on one part or the other. It’s very sad either way.