I posted a response to the apparent 'offence' of the ending on another forum:
why don't you explain why it is offensive?
The issue I have is your reasoning is in style of "The holocaust caused the suffering of many people, so any humour relating to this is offensive". But you're missing the 'premise' that says why this is so..do you think somehow the 'joke' is undermining or euphemizing the suffering of the Jews?
If the 'joke' suggested that the Jews didn't suffer or their experience was somehow enjoyable, or that Jews were somehow inferior to other people, then I'd claim it would be offensive, though I don't think this 'joke' achieves that.
All it suggests is that Hitler killed the Jews for a trivial reason...hmm a little analogous to something else isn't it?
Give me claws and a hunch, just away from this bunch.