Can't weigh in much on bear hunting, but I do support responsible hunting practices, and it's a part of our life and culture here in the Midwest. It's absolutely necessary to keep the populations down to a sustainable level (deer especially), for the protection of livestock and property, and it's great wholesome food for the table.
A good clean shot after roaming about in the woods for its entire life seems like the least painful way to die. I would wager that most deaths for wildlife are far less "humane"- being struck by vehicles, attacked by predators, dying slowly of starvation or disease or injury.
I've never known a hunter to be bloodthirsty; there's always respect for the animal and the land (not all are, I realize), and they are grateful for the food. I think they just enjoy the challenge of being close to nature and having to actually work for their dinner.
Perhaps it's a maternal reaction, but I do feel a sense of sadness anytime a life has to be taken, but if it's for a good reason, then in the eyes of God it's right.
I am a good shot and I've heard that bear is delicious!