Most hunters can't age a deer on the hoof. And experts can be wrong too. Bears are even tougher. Especially if a bear is alone. They look bigger than they are. Especially when you're hunting.
I am surprised that the amount of mistake kills has gone up. Not that people are getting better vision, but I thought less hunters were looking to shoot a small buck these days than back in 2002. For me, if I can't tell if it's legal or not, it's too small to burn my tag on anyway. That's just me personally, but I thought the mentality was changing across the state.