I think this is a gross over-exaggeration. While it is not uncommon for kids to rebel against, for example, their parents at a certain and whatnot, I think this is different than saying that the majority of kids will do it.
The public school system functions as a major conditioning environment to get children used to the norms of society, including deference to authority, following rules, and other things that are generally accepted as good. This is the ideal time for those things to happen because of how pliable the young mind still is.
However, we must be very careful how constrained we make such environments and the idea that safety is guaranteed by subjecting kids to what is effectively zero privacy means we've traded, yet again, liberty for security, thus relinquishing the effective right to both.
This will be as effective at rooting out violence in schools as bombing 3rd world villages has been in rooting out terrorism. Until the underlying issues are addressed (mental health, social disparities, racial divides, etc.) the kettle will continue boiling over and more-and-more unpredictable and chaotic ways.