I don't worry about carjackings where I live , our violent crime rate is lower than any country in Europe.
By Our I assume you do not mean the U.S but somewhere more local, because I doubt that is true for the U.S =p
Anyway, I to some extent see the point of having guns, and if i lived in a country where they were pretty easy to come by, then I Would probably get one. That being said, I am still against having guns easily available. First of all, Humans overall are pretty untrustworthy, even the smart ones are very likely to make mistakes or act irrationally in stressful situations. Add to that how many full on fucking turbostupid people there are in America (or any country) and in my opinion it is pretty clear that even though I consider myself responsible enough to have a gun, the majority of people are not, and increaseing the guns available to the general population including me is going to increase my risk more so than decrease it.
To what scottspfd82 says for example, someone appearantly broke into his home, and he got the gun and they (luckily) ran away before anything happened, Lets say that was just his neighbor who came home wasted went to the wrong house, thinking he was home and his key didn't fit so he figured it would be a good idea to enter through the window. Add a gun to this mix and you are suddenly 1 very small mistake from killing an innocent drunk neighbor, not to mention what people themselves could get into their heads doing with a gun while drunk.
And the statistic that you get yourself into 2 life threating situations on average, whether that is true or not, I am pretty sure the vast majority of those situations get a shit load more life threatening for everyone involved (including you) if you were to have a gun with you. The 1 exception where a gun actually helps you is if someone is only out to harm and/or kill you or your family, if someone just robs you or jacks your car you are a lot better off just letting them have whatever they want than pulling out a gun, as this is greatly increasing the risk of losing your own life, not just the robbers life.
As for the "oh if we dont have guns then the only ones left are the criminals and they will run amock in the streets and kill everyone." First of all, the law enforcement (at least high tier law enforcement like Swat and what have you) will be equipped with guns, it is not your job to go vigilante and stop criminals regardless of if you have a gun or not. Secondly, if you make a lot harder to get, that means they are a lot harder to get for criminals also, and you wont be in a situation where everyone and his mom who is criminal has a gun, and you basically get guns thrown into your lap as soon as you turn 13 and join a gang or what have you.
In norway guns are pretty much illegal apart from hunting rifles and people asociated with the military or law enforcement in some way. And from my experience, the majority of killings are either done with a legally owned weapon because some military affiliated person went crazy and killed his family or something, or is done between gangs where they both have illegal weapons.