I dont think they are cruel....just very disillusioned and naive!
They did seem pretty open to compromise and didnt want to shove their beliefs down anyones throat as such, and seeing their boy so happy with the changes did spur them on to make some permanant changes. So while I disagree with their lifestyle for the boys sake, I have to applaud their willingness to change!
I really hope they do, cos he was a lovely lad and deserves so much better!