I like the question that you have posed, but I am not completely clear on what you need -- are you doing research within Brave New World or in other books but about Brave New World?
To me, the most interesting question is related to the one that you ask. I would ask "in what ways does the society in this book protect itself?" This is assuming that your research is supposed to be within the book itself.
If you ask this question, you can look at all the different things the society does and you can talk about why each of those would protect the society.
Another good question is suggested by (and outlined in) the second link below. It asks why John the Savage is such an important character in the book -- why is it so important to have him be part of both the "civilized" and the "savage" cultures?