Talk to most any of the big, experienced breeders that deal with snake amounts in the thousands. They will smile and most will state that they feed live about a million times a year, just fine. I already described how I do it; I drop the rat into the snake's tub. Snake grabs rat and constricts, If I see the rat is able to bite the snake, I hold its head back with a radio antenna (hemostats would work fine too) until dead.
Sorry, but I don't like to see feeding-live being villified when it is a widespread, easy way to feed. Also, whacking rats is something that I would think could earn you a charge of animal abuse.. this is the last thing that we herpers need.