Why do I believe in the 2nd Amendment?
The Founders were very clear that the right to keep and bear arms was a necessary protection against an overarching government. We can argue whether or not that argument is as valid today as it was then, given modern weaponry, but it's hard to deny that it's more difficult for a government to oppress armed citizens than unarmed citizens.
But that's a "big picture" argument. Let's go down to one person--a woman, making a 911 call, while a stalker is breaking into her house. Listen to the call.
Then tell me you'd have deprived her of her right to own a firearm.
It doesn't matter how close the police were as the man choked her--they couldn't protect her. The police weren't there. The only person she could count on was herself, and the only equalizer between her and a crazed stalker was a firearm.
Listen to the call.