I have one response that ALWAYS gets people thinking. When they say something like, "It's more natural" or "They do it in the wild"...you can say, "Yes, but it's not natural for a snake to be in a closed in enclosure. In the wild, the Snake DOES have a chance at escape if the rodent is TOO vicious. And also, the rodent has more of a chance to escape making it less panicky and nippy to begin with"
"A rattlesnake that doesn't bite teaches you nothing."