First of all, where I live, knives are just as illegal. So much for that argument, I guess. I think it's the same thing anyway, it's a weapon. Yes, knives can also be tools, but here you can't carry anything bigger than a pocket knife, and even that is illegal in certain urban areas with special restrictions.
If I could carry a gun, it would mean everyone could be carrying a gun. And I can't say I like that idea. I know several people who are so mentally unstable that they would definitely use a gun in certain situations, if they had one. No matter how 'tight' restrictions for permits are, if guns are 'legal', it is easier for people to borrow/steal one because generally, there are more weapons around. Especially if lots of people have them in their cars, homes and on themselves all the time.
So, when some homicidal teen takes his daddy's gun to high school, you could blame the parents for not locking the weapon away properly, or you could say that it couldn't have happened at all if the parents had no guns. Because no matter how tight restrictions for permits are, people are going to be at fault. It's a simple statistic.
Also, I probably couldn't bring myself to shoot anyone, not even if I were robbed. And you know what they say, if you pull a gun, you'd better be prepared to use it. Besides, if you're being robbed, you're probably too late to draw anyway. So what are you going to do?
I'm pretty sure I feel safer without a gun.