not sure what kind of experiments they could actually be doing on them in 6th grade, although when I was in junior high we had a science teacher that would supposedly pour liquid nitrogen on a goldfish and then drop it on the floor where it would shatter....never saw it though, just heard about it.
I agree that if they're harming the fish its not good, but how come I never see any threads about folks outraged or wanting to rescue feeder fish from their LFS? It's always "I was in my lfs and saw this poor, mistreated <insert fish here> and took him home to save." What about the 600 goldfish stuffed in the 55 gallon tank with no future? Life is life...if folks are outraged about the mistreated oscars, bettas, etc. they should also be outraged about the feeders....Free the feeders!
I allways felt bad for the feeder animals. Especially the rats. Rats have a bad name they are very smart and are so loving. Feeding of live rats should be baned. The can just blow dry it for the snake, so it thinks its alive.