...but the driver had a legally registered weapon of his own.
He'll get fired even though only a fool with a death wish would deliver pizzas in Indianapolis without a weapon.
The danger depends on the delivery area. Delivering to certain parts of just about any town could get you robbed and/or killed for a few bucks. Note the pizza place isn't named.
As for being fired........My son delivered pizzas many years ago for a place which stayed open very late and delivered all over the county. His first night on the job, his boss asked him if he had a gun. He didn't so they provided one!