“What’s the difference between a cow and the Holocaust?”

The Holocaust (Nazi Germany’s crimes against Jews and others in the 1930s and 1940s) developed into an industry, with many charities, books and films. Some people have been accused of profiting (or “milking”) the tragedy too much for personal gain, leading to the joke:
 
Q: What’s the difference between a cow and the Holocaust?
A: You can’t milk a cow for 65+ years.
 
The “milk a cow” joke—sometimes offensive, depending on the context and the audience—was cited on Twitter on June 14, 2012. The joke was also posted on Reddit on December 23, 2013, with the second line changed to “75 years straight.”
 
“What’s the difference between 9/11 and a cow?” is a variation of the “milk a cow” phrase for another tragic event.
   
   
Wikipedia: The Holocaust
The Holocaust (from the Greek ὁλόκαυστος holókaustos: hólos, “whole” and kaustós, “burnt”), also known as the Shoah (Hebrew: השואה, HaShoah, “the catastrophe”), was a genocide in which Adolf Hitler’s Nazi Germany and its collaborators killed about six million Jews. The victims included 1.5 million children and represented about two-thirds of the nine million Jews who had resided in Europe. Some definitions of the Holocaust include the additional five million non-Jewish victims of Nazi mass murders, bringing the total to about 11 million. Killings took place throughout Nazi Germany and German-occupied territories.
   
Twitter
Troy McClure
‏@MuslimCurry
What’s the difference between holocaust and a cow? You can’t milk a cow for 65+ years
7:24 PM - 14 Jun 2012
 
Twitter
Hamada
‏@AhmadS_K
What’s the difference between the Holocaust and a cow? You can’t milk a cow for 65+ years
9:04 PM - 14 Jun 2012
 
reddit
What’s the difference between the Holocaust and a cow? You can’t milk a cow for 65+ years.” [+194] (reddit.com)
submitted June 15, 2012 by PaladinFTWThe Other White Knight
 
Twitter
politicallyInCORRECt
‏@notPCnairobi
What’s the difference between a cow and the holocaust? You can’t milk a cow for 70 years straight #jokes #Israel #IsraelUnderFire
9:59 AM - 21 Nov 2012
 
reddit
What’s the difference between a cow and the Holocaust? (self.MeanJokes)
submitted December 23, 2013 by sean7755THIS IS MY FLAIR
Jews can’t milk a cow for 75 years straight.
 
reddit
“Q: what’s the difference between a cow and the holocaust? A: eventually you stop milking the cow.” [+156] (reddit.com)
submitted July 29, 2015 by fluffywhitething
 
reddit
What’s the difference between a cow and the holocaust? (self.MeanJokes)
submitted November 6, 2015 by StanleyHitchcock
You can’t milk a cow for 75 years