This one could run and run.
A publication in Iran is looking for cartoons on the subject of the holocaust, on the odious pretext that 'if you do bad things to us, we will do bad things to you - see how you feel'.
No doubt the cartoons will succeed in being at least as if not significantly more offensive than anything published in the Danish press about Muslims. No doubt they will produce predictable and justifiable outrage from many, not least from Jewish organisations.
But, in pure political terms (quite apart from the morality involved), the Iranian move is likely to backfire. For I doubt that embassies in Rome, Berlin, London or Oslo will be torched by crowds demanding the death of all those who make fun of the holocaust. And the many people in Europe already hostile to Muslims will be given another reason to say: 'See, we really are better and more civilised than you are.'