There is NO DOWNSIDE to having a fire extinguisher or a smoke detector.
Sure there is, both could malfunction, one could be used to hit someone with, and cause a great deal of injury, depending on how heavy the fire extinguishser is, etc., etc. Point being,
it's the person's choice in how to protect themselves and their home, per their say, not yours There is a downside to owning a gun
And there's a huge upside...defending one's family from possible death or rape, depending on the bad guy's intentions, not to mention its a constitutional right.
There's always going to be pros and cons to decisions made. Even good decisions lead to bad outcomes, just as some bad decisions could lead to good outcomes. Point being,
its the person's chice regardles of your rationalizations of what's justifyable vs what's not.
Choosing to use a firearm to defend oneself is no different than choosing to use a fire extingusher to protect one's home. Simple as that