It has always been my understanding that the Dolchstoßlegende was put forward by the German High Command against the Social Democrat party after 1918 to blame the loss of WW I on the overthrowing of the monarchy by "republican" forces "back home" (the "stab-in-the-back"). At that point it was perhaps only incidental that many Social Democrats were German Jews.
After 1933 the Nazi propaganda turned a major part of the blame on Jews, unfortunately.
Off-topic addendum: The German High Command of 1918 may have been correct. To this day the German Social Democratic Party has not stopped betraying the country. They are responsible for the 5-10 million muslims in Germany today. And no good will come from that.
“After 1933 the Nazi propaganda turned a major part of the blame on Jews, unfortunately.”
Why would Germany do that?
Pls listen to this guy’s speach: http://benjaminhfreedman.blogspot.com/
Also, search for the transcript and investigate it for yourself. I have. Freedmans claims are almost impossible to accept...but they are true. I dug and dug and proved him correct. I’d be happy to send you what I found. It is absolutely mind boggeling.