I agree almost 100% with Eden One's comment above, except remembering my own experience upon leaving, as a very naive person, having been born in, I really appreciated the guidance of Posters on here, and elsewhere on line, who helped me begin to learn how to think Critically, how to really examine my beliefs etc. and they gave me the impetus to educate myself.
So, though not campaigning to save people, but a kindly nudge to them may be helpful, but, as Eden says, if they are a pig (ignorant) you won't teach them to dance.