Because if someone made the decision that tomorrow no appliance was to attend an incident until the drivers 'all' took driver training, 95% of the incidents that occur will not be attended..
It all comes down to being a volutneer service, and liability.. - To be honest, I think the ratio of accidents to non accidents is pretty good..
Ofcourse any incident involving harm / injury / death to a Vol. isn't acceptable, but unfortunately these things do happen..