You need the safe to store your wasp spray.
No really, it is kind of reassuring when you are not home to be able to lock up your guns——unless you take all of them with you——ammo, passports, cameras, jewelry, money, stamps, extra checks or other valuables. A fire liner is good and if you have someones kids over it can keep them out of mischief.
Of course, they can be breached or potentially carried off but it causes some discouragement amongst the typical smash and grabs yutes.