Killing would be the hard part especially if the kids hatched and raised the hens,BUT if you want to learn how to raise and eat your hens then this would be a useful class. I know my kids could not kill what they raise,or even eat our hens if I did the deed.
I watched hens being killed and processed and then we had them for dinner that night.This was in a small hungarian village where raising and eating your animals was the norm.
The slaughter house was way out of line. I can't even watch those kill videos online.I would be upset if my kids were made to watch that.
I would be ok with my kids declining to kill a frog if they were not given an option to opt out.Signing up for a class knowing you were going to kill what you raise...well I would want my kid to follow through.You shouldn't go into this type of calss knowing you will not be able to do what is required. Plucking and cleaning was easy.I found the killing part to be the hardest.
Maybe the girl signed up for the class with the intent of saving the hen she raised. We saved a rabbit from becoming dog food,and a few mice from snakes. Again,a useful class.
Lets see them raise and kill a pig for class.Ugh,now that was an all day affair with the killing being the hardest.I can clean out guts and render fat,but forget killing!