The point is, it's our right to own guns. If the government wants to take away that right I'm not going to feel any pity when people defend their rights.
First 2 points here: 1, that constitutional rights are backed up by only democratic vote and or popular opinion and can be taken away by the influence of either, 2, that, while not provable without some form of time machine, I do not think the writers of those original amendments could have foreseen and prepared for the kinds of weapons and problems we have facing our current society, and likely would have worded the amendment much differently otherwise. Lastly, your argument appears to be from a strict constructionist view of the constitution, so I will argue along those lines. The 2nd amendment states you have the right to bear arms. It does NOT, however, state you have the right to bear ANY arms you so choose nor does it specifically name which arms you have the right to bear. From there, the government then is well within its bounds to define such so long as you have the right to bear some form of arm/weapon (or if you wanna take to an even further extreme, at least 2 or more weapons). It doesn't even define "arms," so we could be talking about next to anything here.
But I personally believe such strict interpretations are foolhardy and worthless. The Constitution does not have an exhaustive list of circumstances in which it may be applied. Clearly, in order to gain any useful legislative principles out of the constitution one has to interpret said document. Interpretation is very much a product of opinion and popular discourse, and thus will always be subjective and may vary wildly from person to person or generation to generation. The constitution is not some stone-carved engraving from which there is no relief or discourse, it is a document which is constantly evolving to meet the problems and beliefs posed in an equally evolving society. In the case of gun reform, there is reasonable argument that change is necessary. It's why we have the whole amendment process in the first place.'
Thus, the only "rights" you could be referring to here are those granted by virtue of your humanity or by some deity, at which point we've arrived at the boundaries of philosophy and subjective opinion reigns.
Crazy idea here: freedom does not operate on a linear scale. Sometimes you trade some freedoms for others. People who are voting for gun restrictions do so because they believe it will increase their freedom to live without fear of being shot.
Also this. It's not like the people who vote for regulation get off on impinging other people's "rights." They're doing so because the believe it to be for the good of themselves and humanity in general (unless they have some kind of mental condition). I don't believe in the Snidely Whiplash supervillain, but I do believe in the POTENTIAL for evil and the misuse of resources. Humanity would do best not to turn on itself.