Both activities require physical skills, training, proficiency, the ability to be emotionally under control.   The consequence of failing to do these things could result in death.

Preparing  for license test might just get a young shooter a pretty firm start and improves the odds of good citizenship.(not killing anybody by accident, including themselves).   It wouldn't be perfect, people still screwup in car's.  But we know insurance actuaries discount premiums for young driver's who also have a Driver's Ed course,   Getting better training means safer driving/shooting.

At what age does gun ownership become a right?