if a primer goes "click" instead of "bang"
i saw a video of a guy hunting elephants, his gun went "click", the elephant turned around and came after the dude. He was lucky the guide was a good shot and killed the elephant.
imagine if it goes "click" when you are hunting bear, alone. If you have a bolt action you can fix the problem a little faster. Also the gun could malfunction, the possibilities are greater with a semi.
but like i said above: this is just my opinion.
I really don't get how actuating a bolt, and pulling and releasing a charging handle, are really that different. Additionally, I am WAY more familiar, and comfortable, with the AR platform than any other.