Knives are in nearly every household yet accidental deaths from laceration are not very common. Maybe they’re not nearly as prevalent in media so kids don’t think to “play” with knives. Maybe they’re just not as deadly as guns (they’re absolutely not).
The biggest difference between knives (plus the dozens of other dangerous household items that any normal person owns) and guns is the purpose. Guns are intended to harm living things. I cut things almost daily, but in 40 years I’ve never had a situation where I thought a gun would’ve improved the outcome.