And it's such a common mentality too! "But won't the snake defend it's self". NO! And even IF they would, why would you do that?! It's one thing to feed live, because some just require it, it's a totally other thing to think it's "cool" or whatever and want to witness unnecessary carnage.
I hate feeder mice. They are some evil little beings. But, I don't want to watch them suffer unnecessarily either! We had a system for pre-killing that made it quick and painless for the feeder and not subject it to substances that could harm the snake. I hated doing it, but it had to be done. People would ENJOY watching me kill. Totally creepy. And people would get mad if we wanted them to feed pre-killed to a proven eater. Like, wtf?!
"Cage aggression" was also a common topic of dispute. If you feed your snake in it's living space, it will get to the point where it strikes when you open the cage. Snakes are pretty darn smart in some ways. But nah, we never knew wtf we were talking about. We just lived, breathed and worked these animals 24/7.
And that's why I quit. I got so sick of seeing mistreated animals. I kept getting in trouble for refusing sales. It just wasnt worth the crappy pay. I loved the animals. If I could have worked with just the animals and no customers, I'd have been fine lol. And the store started cutting corners. I think the straw that broke the camel's back was when I got let go early for refusing to sell a commonly aggressive tarantula to someone who has never owned one and wanted "the biggest, meanest one". Nope. Go away. And no, I won't sell you a death stalker, either! Gah!