The Catholics in your example think they're doing the right thing, the Thelemites know that they're doing the WRONG thing on purpose for any given occult operation. I am more knowledgeable on OTO, but Thelema falls into an area of clandestine Masonry in which all non-initiates are regarded as sub-human animals. The entire function of Crowley's work is to set changes into motion to create an theocratic occult elite totalitarian state, the "Age of Horus." The primary acts to bring about material change from mental will (aka magick) are all SEXUAL, the eucharist for the assemblies is derived of semen, menstrual blood, and fecal matter baked into wafers. It's hard to put metaphysical ideas into elevator pitch style explanation, but I assure you, those who work Crowley's programs are intentionally and knowingly doing awful things for selfish means in horrible ways that no sane person could dream of. Let's put it another way, if you knew Jimmy Saville, Jimmy Page, and various Danish nobility (see: Dutrox incident) had a secret society to commit sexual crimes in a ritualized fashion to bring about metaphysical changes, would that resemble anything you could remotely called "good"?