Apparently not. There were bystanders that failed to report the crime. Some want them held accountable.
Such a law would be unenforceable. If one person reports it, do the rest of the people still get prosecuted? What if there's a shooting, does everyone in the neighborhood get arrested?
And some people, horror of horrors, took pictures of it. And people are trying to arrest them for it! What's next, the school is arrested for activity on their surveillance tapes? If this happens, these bystanders will find it almost impossible to find a job or a house due to sex offender laws. This is just more of the government legislating data. Of course, someone cited the sexting cases to justify this. PROTIP: Don't cite stupid laws.
Then there's the issue of the underage rapists being tried as adults. Many of the rapists I assume were also under the age of consent; so, technically, they were also raped. But this stupid technicality aside, it is absurd to treat youth as inferior until it comes time to punish them. These criminals had no say in electing the judges, will not get a jury of their peers, and are being seen as too irresponsible to drink or vote or drive but responsible enough to be tried as adults.