My problem with articles like this is that it ignores the fact that adults frequently act fearful and crazy too - especially when acting collectively and/or politically.

You wouldn't have politics in its current forms if adult humans were fully rational and able to treat fear-mongering demagogues with indifference and contempt instead of adulation.

Perhaps the real difference between adolescence and that kind of adulthood is the fact that adult craziness is mainstream and socially sanctioned, so it's not seen as crazy, while teen angst is considered proof of immaturity because it's not 'responsibly' frightened like adults are.