I think as long as you explain the importance of all animals it doesn't matter too much. I was at a Petco and there was a guy with 2 kids. Maybe 4 and 6. They were looking at the mice and the dad joked "hey we should feed them to the snake! hahaha" and the kids were like "but won't it hurt the mice?" and the dad said "It doesn't matter, it's only a stupid mouse."
While I do not mind live feeding, I believe it's extremely important that people learn to RESPECT all living creatures, even if they're being fed off