No one wanted the communists except for the communists and the Socialists so the Commies naturally turned to violent revolution. It was put down by elements of the remaining German army and correct me if I am wrong, outside assistance was provided as well. There's no question about it the similarities between then and now are frighteningly familiar.
Desperate hungry people do desperate things. Add that to an abundance of newly ideologized socialists, communists and the anarchists you mention and it is a prescription for disaster.
I think most people who are conservatives (i.e., not socialists, not communists, usually not anarchists as liberals tend to be when they are not in power) understand that during the post-WWI years, Germany was starving because of the armistice reparations forced on them and that people were dissatisfied - some looked to communism and socialism which were still in the experimental stage. They flirted with a pit viper, and it bit them.