What's wrong with basic operations and range training?
I know several people who recently bought guns after the panic who haven't ever shot one.
They're the kind who put it in a drawer and hope that they know to operate it when it counts.
If you know this and think mandatory basic training is an ok idea, would you be willing to pay for all them to take some professional training? What if they can't afford to miss work to take a class, would you be willing to reimburse them for lost wages too? How about a babysitter, transportation money, extra ammo etc, would you pay for that too?
The above only touches on some of the most practical issues involved in mandatory training many others are covered already in this thread. Training is good and should be encouraged, but mandatory training is not. Not only is mandatory training not practical but it allows a substantial barrier to be erected between citizens and their rights.