I understand that the suspects 17 years of age and older have no "consent" defense available to them, but the 14 year-old suspects do IMO. If an 11 year-old and 14 year-old voluntarily have sex with each other, how could you prosecute the 14 year-old? Both are children in the eyes of the law.
disclaimer: I'm not suggesting that what was done in this particular case was done voluntarily by the 11 year-old, but I can definitely see an argument being made on behalf of the 14 year-old suspects for charges not to be filed against them.
either way, a bad situation that deserves harsh punishment for all involved.