Pushing the envelope
People, especially children and teenagers will push parental boundaries to test a parent's love for them. Imagine a child who comes to their parents to say "I've decided I want a lifestyle of hard drug use, promiscuous sex, and loud, angry music". Imagine a parent's response of "honey, you know we love you, and while we disagree with your choices, we will respect your wishes and support you however we can." What did the child learn about love? What did they learn about how much their parents cared for them?
Where were the boundaries that guide good choices? Where were the parents who could say "Because we love you, and because we believe those choices will lead you to great unhappiness and an early death, we will oppose them, set boundaries for you, and work with you to develop good choices for your life."?
Not born with a road map
Kids today, cast into the world, look around and see people dropping dead in the streets from drugs, others living in homeless camps, or simply leading lives of quiet despair not knowing how to live. All around them they see adults who make bad choices and who cannot seem to connect their unhappiness with their actions. They see people blaming others, their circumstances, society, poor education, other races, corporations, capitalism, their own parents - essentially anything but themselves and their own failings.
Instead of observing how people confront adversity and work to overcome it, these kids have no models for how to draw upon their own resources to learn and grow and turn failure into success. They have no well of wisdom to draw strength and ideas from. Instead, they end up floundering from one mistake to the next, not knowing how to break free.