The reasons behind Charles Manson's crimes include that he was chased off the property of terry melcher who Rudi altobelli bought off of him, later charles came back asking for Terry and was rudely escorted off property by one of Sharon tate's house guests im guessing it was Jay sebring who told him to ask Rudi Altobelli in the guest house. Altobelli admonished Manson for bothering his tennants. Manson knew the layout of the house and knew who was living in it it is quite possible Charles commited the muders because charlie wanted to pay back the residents for rejecting him.