Those who most fervently proclaim our right to bear arms "for self defense" have seldom looked another man in the face and killed him with a gun or combat knife. I doubt that anyone of us who has done so with any regularity spent much time pondering about whether the gun or the bullet or the knife killed him. We did.
Thank you for your service, Phil.
You bring up a very interesting point, regarding how people view self defense (at least when it comes to doing so at the level of lethal force) in our society, particularly the United States but even in the UK, from which our laws about self defense are derived.
It is important to point out a few things. Bringing up first and foremost that I'm not a lawyer, this isn't legal advice, etc:
1. Self defense laws have very little to do with guns, specifically, although their application often involves their use. This is why by and large the US and UK share similar "castle doctrine" laws being derived from the original British common law, yet their laws regarding who can own firearms are much different in most jurisdictions.
2. People who buy guns for self defense often, and probably most of the time, do not know the laws pertaining to (1) and ought to educate themselves, because it is critically important to the entire issue of self defense, and certainly more important than actually having a gun in the first place.
3. Whether or not you have a gun is pretty far down the list of what will determine your survival.
Now, before I continue, let me say that I've been involved in the shooting sports for awhile now, so I'm going to be biased to the RKBA side of things. I even went and became an NRA instructor so that I could teach the basic pistol course and have some level of credibility when I introduce new people to the hobby. Living in a state with onerous gun laws, I'm not convinced they really accomplish anything other than get certain politicians elected (which if you examine the issue, was the likely goal in the first place). Not that one doesn't have to obey the laws in their state--it's absolutely a requirement--but I am not convinced that they're having an appreciable effect WRT violent crime.
Even still, whether or not anyone can effectively become safer by being armed depends more on the person's level of education WRT self defense and the law, as well as their mindset, and not what kind of gun they have or what caliber it is. A person without the proper mindset has the capability to endanger not only himself, but others, even to that level which he thinks he is attempting to protect himself or his family. People who advocate for RKBA for self defense need to understand that proper education and training is the first step to being effective in this area, and thus, should seek out resources to that effect in tandem with seeking out a firearm for that purpose if they so choose.
This doesn't even touch on the issue of safety around guns, but statistically that's not a huge problem in the US despite it being harped on by the media. Most shootings are intentional, whether it is a matter of people doing it to each other, or themselves. It's still incredibly important for anyone who plans to be around firearms, and it must be practiced religiously, because such a person is not only responsible for their own safety, but the safety of those around them and those who would use them as a "role model" for proper handling of firearms.