If the Jews Would Have Had Guns...

That Gun Argument Citing Nazi Germany doesn't stand up to history.  From Wikipedia:

Few German citizens owned, or were entitled to own firearms in Germany in the 1930s. The Weimar Republic had strict gun control laws. When the Third Reich gained power, some aspects of gun regulation were loosened, such as allowing firearm ownership for Nazi party members and the military. The laws were tightened in other ways. Nazi laws systematically disarmed "unreliable" persons , especially Jews, but relaxed restrictions for so-called "ordinary" German citizens. The policies were later expanded to include the confiscation of arms in occupied countries. (Link)

 In other words, the gun laws were actually loosened under the Nazis, except for enemies of the state, which included Jews.

It should also be noted that there were two very powerful things happening in Germany that worked against the Jews and other enemies of the state, and a third that would have happened.

1. Hitler and the Nazi regime were NOT unpopular. In fact, he was seen as a savior to the country by many. They followed him and said nothing when he did things that were clearly way outside the bounds of civil society. 
2.  As a result, by the time anyone really recognized the issues and what was happening, the power was so great and so consolidated, that his power was overpowering. He had already convinced even the official German church to support him and bless his vicious and horrific government actions! Only if the troops, en masse, turned against him could there have been a different outcome. That became impossible within only months of his legal appointment as Chancellor.
3. The instant, the very second the Jews would have started to defend themselves against the laws of Nazi Germany, at that moment they would have been the bad guys with the guns. From that single moment on, all those good guys with the guns would have been given the go ahead from Hitler and the government to kill them!

 The real lesson is to oppose bullies, scapegoating people who are different, taking away the rights of people we may not like, and believing the lies and rationalizations based on nationalism and race supremacy!