I guess it depends on what you assume their motives are. 40-50 years ago, lots of schools had competitive shooting teams as part of their sports programs. Before that, these programs were among the many that kept the 'art' of marksmanship growing in this country. If the intent is to educate, then we should welcome a (albeit small) step back in that direction.
You think schools are bringing back gun clubs with this letter?
They want a record of gun ownership and are using the children to do it.
If I touched my fathers guns without his permission my ass would not make it to school for a week.