Parents need to know that this movie will give thoughtful teens some things to think about -- balancing the need for security against individual rights, the difficulty of deciding whom to trust, and the factors that lead to hate crimes.
My son is very mature for age 14 - HE could probably 'handle' it. However, I don't plan to show it to him (we don't even do most PG-13 with him yet!). As stated, it is 'hauntingly' realistic and VERY thought-provoking. It is an intense thriller that can be a real eye-opener for adults. As a former soldier and concscientous conservative patriot, I enjoyed the movie immensely, however, I cannot say that I recommend it for ANY one under the recommended age for Rated-R movies (age 17). The four stars is for adults - children should NOT watch it.