Oooohhhh.
I'll take a stab.
First of all, it's not about need. It's about want. In all cases my right to keep and bear arms is independent of any particular need. In fact, only Boston has the unmitigated audacity to proscribe such horse pucky.
Second, They are incredibly fun to shoot. Like momma said, don't knock it till you try it. If, after shooting one with you, she still has any questions, then we'll take it up at that point in time.
Finally, to the dolts who say, "only police need guns," or any of that silliness.
Ask them if the cops are always around?
Ask them how long they think it will take for the police to arrive.
Ask them why they think the police are going to come, on time, when they call, when the Law Enforcement community, through Supreme Courts, has said numerous times that they have, "No affirmative duty," to respond to or protect any one citizen at all.
Ask them how much damage an assailant could do to them in 5 minutes? Ask them what the chances are that the police could get to them within 5 minutes?
Ask them if it would matter if the police showed up at all after 6 minutes.
If she still looks at you blankly say. "let me get this straight. You are going to trust your safety to a very small, understaffed, often under-equipped group of citizens wearing blue shirts and gold stars who:
1. Have clearly expressed that they have no responsibility for your safety
2. Are unlikely to be handy when you need them even if they wanted to help
3. Have no charter, goal or intention, of being a protective force but for the aggregate.
No there job is to solve crimes and catch criminals. Ask any police officer; See what they say.