No, cars are useful when they're used appropriately. Cars are not necessary all the time, either. They are deadly, when they are used inappropriately. Same with firearms. And the type of firearm accident you're referencing here are also very rare, when compared to the millions of lives saved, when a firearm IS used appropriately
As the addage goes, better to have a firearm and never have to need it, than to need one, and not have one