The only reason Hitler would even come up is the usual attempts to wield him as a weapon.
Regardless of that, the Founding Fathers made it clear in their writings that the main motivator behind the 2nd amendment was self-defense from perils both external and internal. We've seen enough examples in history of what can happen when a citizenry has no ability to fight a government with a strong centralized power base. It's just too damned dangerous.
Unfortunately there are those who want us disarmed and make no hesitation to cash in on the bodies of children and movie-goers to do it.