@msolga,
I think the 2nd amendment, at it's very basic, is about the right of the individual to protect themselves and their famiy against those that wish to cause harm, and to protect one's property from those that would try to take from them.
In that sense, I find the 2nd amendment extremely relevant to the US at this point in time. I think it's unrealistic to demand someone delegate their responsibility for their own protection to our police force, a police force that is NOT required to protect the citizens (courts have made this ruling).
I think you're an Aussie, and I do not know what your crime rates are like there, but I'm certain that the USA is much higher. Even our non-gun crime I'm certain is much higher. So I can understand why this may seem strange to you.
Guns in the USA are treated much differently than it sounds like they are where you are from. There are more guns in the USA than there are adults, almost everyone I know owns a gun, and these are not anti-social people, nor are they killers.
I am one of 'the folk' who thinks that citizen militas is a valid reason to own a gun, and went into my thinking (not the only reason, by far) when I purchased my last rifle. I am serious about it. I hope it never, ever, comes down to that, but I am determined not to sit on the sidelines if our government were to start seriously trampling on the rights of our citizens.
Regarding the 'show & tell', I've never quite understood that either, but purchasing a gun isn't much different than many other purchases in the USA. When I buy a new car, I like to show it off. I didn't put much more thought into buying my last gun than I did buying my last television. I decided that I wanted to by one, I did my research, I drove to the dealer and bought it. It's really not out of the norm.