Kristallnacht should have been a warning. Whenever people go after someone, even if you don't agree with them, even if you disagree strongly, if people's basic human rights, like food and water and safety, are gone, do not look the other way if there is something you could do.
Please also remember that when we're dealing with Iran, we're dealing with people who say this never happened, while actual survivors are still alive! Many people deny it happened at all, in many countries, including ours. We must remember.
If you click on the cartoon, it will enlarge, I think.