Answer:
The establishment is a clause that is used to protect religion, it's in the first amendment. Manson had led a "cult" that was full-on white supremacy. Manson got mad due to his "cult" going against this clause. This clause played a major role in Manson's murders because of who he had in his cult but some of the murders committed.
Step-by-step explanation:
Charles Manson based his cult on Helter-Skelter, which was basically a prediction of a racial war.