Books hold knowledge and bring all the books is pretty much burning all the knowledge. I think that she did not want to lose the knowledge.
It is dangerous for him to be friends with Clarice because his job is to burn books and sh is opposing the law. It is kind of like a prison guard becoming friends with a dangerous inmate.
Breaking the rules is worth it under the right circumstances because it can change the world for the better like during segregation, civil rights leaders broke Jim Crow laws to get freedom and now the world is a better place for everyone because of them.
I wonder if inventors took ideas from this book to make talking cars and other things. Or is it just a coincidence?
I do not understand how burinng the books if for the good of the people.
I think they watch what the government wants them to watch