I know of no amendment dictating marital gender so your point is fallacious. Originalism is a bogus tool to use: the Founding Fathers predicated racism, too, is that to be left in place because of original intent?
If gun ownership made a society safer, we'd have the safest one. But we have the most murderous, by far, of any developed nation. By far.
And you may know that we aren't a nation of cabin dwellers; we've been mostly urban for a long, long time. 
Owning guns isn't a logical choice, it's emotional. Only a person crazy with fear and anxiety wishes to own one for "personal defense." Fact is, it makes you more likely to perish from a gunshot, not less so.