Would a parent's travails have been any different 20 years ago? Then we'd blame video games. 20 years before that? Television. And 20 years before that? It's that damn rock 'n' roll, etc., etc.
Or it's just that kids stop being children, go through a difficult phase starting somewhere between 11 and 13 and emerge as adults sometime later.
At around the age of 12, a child's corpus callosum goes through major changes: the connective area between the left and right sides of the brain thickens allowing for greater connectivity across the brain. Not coincidentally, this is also the time that kids most often start questioning their parent's rules (including their religion) and strike out on their own intellectual journey.
Maybe butterflies don't like the chrysalises their caterpillars become, either.