It's better to know a few things about guns than not, and you best learn those while acquiring a license. You can't guarantee that there won't be a situation in which it is good to know how to disable a gun or that someone is making a mistake while shooting that allows you to get to safety, and you might want to be able to distinguish the sound of a gun shot from that of a firecracker. I'm not expecting it to ever become necessary, but having had instructions on how to handle situations is always a good thing to have in your knowledge repository.
Also, having had a Kalashnikov in your hand and fired it helps you understand what's dangerous about these weapons.