Maybe you don’t realize that a firearm is not an instant safety net. There are many instances where just the display of a firearm instantly escalates a non-shooting situation into a shooting situation - which greatly endangers everyone involved (including and especially your family as they’re now near the target of the other shooter and their bullets). 

Another reality that firearms present is they can be taken from the user. Dorks with no experience can and do get their guns taken. 

In both of these situations a gun has made the situation exponentially more dangerous. Often escalating a situation from something that could’ve been avoided with situational awareness into something deadly. 

Force multipliers work both ways. You’re not some badass and your gun has just as much change of getting you or your family killed as it does of “protecting” them. Ignorance to think otherwise.