“Why do you need teh gun?” – Because it’s the duty of every law-abiding American to own and be proficient with firearms.
“You’re joking, right?” – Oh, sort of.
“You know what I think? I think gun owners are compensating for something?” – Oh, haha. Never heard that one before. Honest.
But no, you’re right. We’re compensating for the fact that our society is full of the depraved, the amoral and those that think their ends justify their means.
“Owning a gun is about teh fear!” – The same way buying insurance is about “fear” of fire or accidents, or the same way packing blankets and candles in your car is about “fear” of icy roads and blowing snow. In other words, baloney. It’s about responding prudently and reasonably to things about which one might be legitimately afraid.
“Aren’t gun owners just a bunch of teh flaby bald white guys?” – Sure, in the same sense that gay marriage proponents are a bunch of mincing, flouncing, buttless-chaps-wearing effeminate show-tune-singing poofters.
“Hey, that’s nothing but teh derogatory stereotype, designed to try to negate your opponents arguments by dehumanizing them without ever engaging any of teh facts!” – Bingo. The difference is, I don’t believe the thing about gay marriage proponents.
“But teh conservative GOP Senator with teh “A” rating from teh NRA said big clips are useless for hunting!” – Then that “conservative Senator” should get docked a few points. The 2nd Amendment doesn’t protect hunting!
“OK, smart guy, why does a citizen need a gun with teh big clip for?” – For starters, it’s only a “clip” if it “clips” the bullets together. Like this:

If it’s a metal box, like on an AK47 or an AR15 or a Glock, it’s called a “Magazine”.

Remember that and you’ll sound marginally less ignorant.
OK, now to answer your question – and I say this without acknowledging if I do or do not own one or more weapons with high-capacity magazines; if I do have them, I need them because the threat, out there – robbers, burglars, gang-bangers of all stripes – have them. Indeed, gun and magazine prohibitions make them more likely to have them.
Now, I don’t hunt, and I never likely will. But I am a self-defense shooter, and anti-gunner wives’ tales to the contrary, there have been cases when armed intruders and home invaders, whether high or highly motivated or both, have opted not to turn tail and run when the home/business owner fired six, seven, eight or ten shots. It’s happening often enough that most cops have not only traded in their six-shot revolvers for semi-auto handguns with 15-18 rounds, but retired their good ol’ shotguns for AR15s and M4s – fully-automatic assault rifles, not merely ugly “assault weapons” – in the trunk (leaving lots of surplus Remington 870 Express 12 gauges going for really nice prices at area gun shops!)
“So you think your life is as valuable as a cop’s?” – Yep.
“But robbereys like that hardly ever happin!” – Either do car crashes. But you wear your seatbelt, don’t you?”
“No! That’s what teh Police are for” – OK, then.
“But conservative Republican Joe Scarborough, who says he’s a member of teh NRA, says there’s no need for guns that can fire 30 shots in teh second!” – Joe Scarborough was a conservative in 1994. He makes vaguely Republican noises these days, on some issues. But it’s with this remark he not only shows why he can’t get a show on a real network, but that he must be one of those rare NRA members that knows nothing about firearms. Guns that “fire 30 shots a second”, fully-automatic firearms like machine guns, submachine guns and real honest-to-pete military Assault Rifles, have been illegal for most citizens since 1934.
“But killings with assault weapons are out of control!” – As usual, no. Murder in general dropped 14% in the past four years, and the drop among firearms deaths led all others. And out of 10,000 or so firearms homicides in, say 2007, 358 involved rifles, which is down sharply since the mid-20002, and about a quarter of the 1,704 knife murders, not to mention much much lower than the 540 involving blunt objects, or the 745 people killed with fists and hands. And I’m going to bet that the vast majority of those were not legally purchased, by the way.
“Well, you are kidding yourself! No citizen has ever stopped teh mass murdor!” – Sure they have. I listed the ones I could find here. And those were just the cases where the authorities said in as many words “there was a mass shooting incident underway”, which they usually won’t if it stops before anyone’s hurt. Check it out.
“Well, you are teh coward. A real man doesn’t need teh gun and I’m proud of it!” – Well, that’s your choice. Go for it. In fact, take that feeling to the next level. Put one of these in your front window.

No, seriously – your masters have decreed it, so you have no choice. Put your ass, and your family’s safety, where your precious little mouth is. Deal?
Get right on that!
“Well, it’s time to have a conversation about guns” – We’ve been having one for almost forty years. And the gun-grabber side lost. And they’ll lose this time too, because outside the self-referential, self-adoring, rhetorically-onanistic lefty cluster-cuddle between the media, the alt-media, academia and the lefty wonk class, most of America has been convinced that you’re wrong.
Which doesn’t mean people like me – law-abiding citizens who believe in and practice the Second Amendment – are going to stop working to keep the battle won.
Because we’re always “having a conversation about guns”. It’s just that you want the other side, my side, to shut up and let you do all the talking.
And as much as you’d like that, I for one decline. Thanks.