The Germans backed off a bit at Dunkirk but we are off topic.
The claim is that the RKBA is irrelevant to protecting folks from genocide.
The example chosen was the a few poorly armed Jews at the last moment did not stop the Wehrmacht.
The Jews later did defend the state of Israel without the best of weapons at its founding.
One can chose to get on the bus or the train to go to the camps without a peep. You can say it won't happen here (no one is saying that it is planned). But if it comes to that - now people know better. Given that, the RKBA is paramount to preventing planning for such a horror happening again.