As far there is someone that is 100% willing to take home (with a proper space for the chickens) all the chicks if they don't find other homes, that knows how to and can properly take care of them, that knows what to do during incubation. Then, there's no problem.
What I wouldn't approve is when people that have absolutely no knowledge try improvising things. Then they have chicks hatched with problems due to the incubation and they don't know what to do and they don't know how to take care of them, so the chicks suffer and die.
Many people out there think that newborn chicks need just 70°, that they can feed them just bread and/or veggies and they will thrive well. I have no problem with this, there's always time to learn and nobody can know everything. But if you are planning to get or take care of an animal you have to learn at least the basics before getting it.
So, like for every person that is planning to take care of a living being, teachers have to know what they do if they are hatching chicks at school.
I think that is a great experience for kids (and also teenagers), especially when, now, less and less people know farm animals. There are kids that have never seen a chicken and think that the meat in the supermarket appears from nowhere or like grows on trees.