We're a free country because of our firearms, and we're not about to give them up. You should be happy about that.
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And just as an aside, I haven't personally owned a gun since I came back from Southeast Asia in 1965.
I think that is certainly a debatable point. We had a revolution and got out from under England with significant help from personal firearms. If you look at other countries that also used to be under British rule, they are also all free countries now and they didn't all have a bloody revolution to get there. Canada is a good example.
Now I'm not saying the Revolutionary War wasn't a good thing but chances are we would be an independent nation by now anyway.
After that, the firearms that helped protect our freedom were military issued and deployed, like your time in SE Asia. Your average armed citizen really had nothing to do with maintaining freedom.
You could make the argument that they would be a deterrent, but like we just saw in Las Vegas, personal arms can't typically compete with military grade arms.
The only reason we really need personal guns today is that others have them but this generally doesn't hold water from a statistical standpoint. Firearms also make it so easy to commit murder in a moment of passion, or for toddlers to shoot each other or their parents too. That happens a lot more frequently than the "good guy with a gun" saving the day. They make their owners feel better but statistically it also puts them in more danger.
That being said I have two guns in our house that I reluctantly accepted from my father in law who was terrified at the thought of us being unarmed. We keep them locked away and unloaded which is the safest thing to do if I must have them. But I don't feel safer. I worry that one could fall into the wrong hands somehow and contribute to something horrible. I doubt it will happen but I know that is statistically more likely than the guns enabling me to protect my family from a criminal.