I also agree that it is okay to feed live. In general, if the snake is hungry and strikes right away, there is little chance of injury to the snakey.
Injury can still happen. I have a hatchling that is not the best @ striking and would strike and miss. She is a tough one because she is not trained on dead food yet but is so piss poor at striking and wrapping.
My other BP have no trouble wrapping the prey. I would still like to get them to eat F/T but it has been a long process.
It is okay to feed live as long as you are smart about it and take all the possible precautions that ladyball mentioned. Some snakeys just won't eat dead. Still, I believe that the most ideal is to feed f/t, but that is not always going to work.
The way I get my BP to eat f/t prey is either heating it and seeing if I can get a strike and wrap or I follow the foot of the live prey: ie when the bp is about done swallowing the live mouse, I put the head of the f/t rat into the bp mouth.
here is a pic of the first rat I ever got my male to eat. BP had to swallow a live mouse first before the rat followed.

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Longtang. I like snakes and rats.