The spark of corruption is caused by insecurities or anger. Miley for example had become a popstar and got consumed in that, that her simple life became courpted. sometimes it can become concious and they choose to change and somtimes its just happens by living a different life style.
Loved ones probably didnt know about the choices miley was making because she wasnt under the rules of her family anymore, she was under the rules of the world. In our society being courpted by anything is never a good thing but some things like courpted by christanity is not necesarily bad in our society.