Interesting, but you have a few holes in your argument the Holocaust or any other systematic genocide for that matter would have taken more to stop than a few guns.
You have to remember the Holocaust involved more than just Jews, it was the state policy of Nazi Germany to eradicate the "untermenschen." This included the Jews, Gypses, mentaly handicapped, homosexuals, blacks, and various other races they viewed as sub human; also people who were opposed to Hitler. The Slav's were to be used as slaves to farm Russia as far east as the Volga when the war was over. They planned on depopulating Eastern Europe except for the Slav's so the German settlers could have workers.
What needs to be remembered is that the Nazi party was a political party like any other and that the Nazi government was a duly and democratically elected government by the German people. Hitler was voted into power, and the German people voted all their rights away right after it. They probably did this to fill the national hole left by the Kaiser but that's another argument. Anyway in the 1930's Hitler and the Nazi party did a lot of good in Germany and were widely support both in and out, for awhile we had a very active Nazi party in this country which interestingly Hitler didn't support. Many prominent Americans supported Hitler, such as Henry Ford and the Kennedy's. To this day we still enjoy some things that came from the party, our modern interstate highway system for example is modeled after the Autobahn, VW was essentially created by Hitler and Dr. Porsche, etc. Also NASA owes them a lot.
My point is that a few individuals with guns cannot change state policy, enter the 2nd amendment. The 2nd amendment doesn't protect your right to own a hunting rifle, or carry a Glock for self defense, or play solider run and gun in the desert on the weekend. A few individuals with weapons can have an uprising such as in Warsaw but by that point it was to little to late, and the SS quickly crushed them. 2A protects the citizens rights to form militias to overthrow the US government in the event that voting brakes down. Cause the Founding Fathers for all their faults were very smart people, and they knew that people can be swept away by devils with silver tongues and vote guys like Hitler into office. So they put a few checks into the system to prevent this, the electoral college is the first, 2A is the final. 2A is as more about mentality than it is about firepower, firearms are simply the tools to achieve the desired outcome.
The Jews fate was sealed in Germany for many reasons, largely culture. They were Germans, they were raised to obey authority and had not the slightest notion of the 2A and what it means, nor the means to carry it out. They also didn't realize until it was to late exactly what the Nazi's were planning. Heck a lot of them were party members for awhile, and their kids in the Hitler Youth. Having firearms wouldn't have changed anything since they lacked the culture to use them.
Lastly the Swiss were never invaded because they were the Germans bank, you don't attack your own bank. Certainly being well armed didn't hurt, it moved the risk vs reward equation in their favor. But don't think for one minute the Wehrmacht wouldn't have rolled right over them if they were ordered to. The Swiss knew this and their entire defense plan involved a fighting retreat. Geography was also on their side; there country has a lot of mountains and they are located in an area of Europe that really isn't an invasion route from Germany to France. Unlike say Belgium which is screwed either way, they are France's front door to Germany.