Robert Heinlein wrote many science fiction novels for young adults. Without exception these novels are interesting while promoting self-reliance, including weapons' ownership and use to maintain/protect people. There is no librarian who would object to these novels being available for loan.
Hope this helps.
***
A human being should be able to change a diaper, plan an invasion, butcher a hog, design a building, write a sonnet, set a bone, comfort the dying, take orders, give orders, solve equations, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
The Notebook of Lasarus Long