Always blaming the parents is easy/ convenient but quite often the lazy man's answer to this. Every alcoholic did not have bad parents nor did evey teenager who exceeded speed limits or was driving too fast for weather conditions. Nor is every suicide or childhood cancer (or other fatal desease) a parents fault.
The US CDC list the top 5 causes of people from 10 - 24 as:
1. Unintentional injury ( pretty broad category includes traffic accidents, drowning's etc)
2. Suicide
3. Homicide
4. Malignant neoplasm ( cancer)
5. Heart desease