There's no guarantee of results, it's just another way to introduce people to non-ordinary states of consciousness/mind. Certainly don't ever do it without someone's consent, and don't impose some sort of belief structure over what's personally and independently cognizable and knowable. I suppose I have a hard time saying that un-erasable insights are "brainwashing" because that's like saying traveling abroad is like being a traitor. Really, it makes you a stronger citizen, because then you have terms and modes with which to compare, and you also have a newfound wealth of treasure and discovery to help accelerate your own nation, to bring the simile full circle.