So many gun deaths come from suicide. Would many suicides still happen, by other means? Sure. But a lot of them would be prevented by tougher access, longer wait times, and better locked storage. Many people, especially men, are incredibly impulsive and may make a decision in the heat of the moment that they can’t take back.
Also, safety courses and required locked storage would ansolutely reduce instances of toddlers shooting each other, and I for one think that’s a good thing.