Drunk teenagers and responsibility

I am courting trouble by commenting on the Roast Busters case. For those who are not up to date with this sordid case, some youths in Auckland bragged on social media about having sex with drunk underage girls. The police were blamed for not prosecuting these boys. The Police Conduct Authority blamed the police for incompetence. Such cases clearly need to be handled with tact and care, and the police failed in their procedures. I am by far the wrong generation to comment, but I have some questions that are unanswered. How did these young girls, 13 and 14 get into a situation where they were so drunk that they consented to having sex with these older boys? There was no suggestion that sex was forced, that they were raped. What kind of moral lodestar allowed these boys to exploit these young girls? Where were the parents? Did they know or care about what their sons and daughters were up to? Why did none of the parents of the girls confront the parents of the boys? Is this a symptom of a society that lost its moral bearings? What would I have done? What would you have done? Blaming the schools, blaming the police is not the answer.