I hear that black magic encompasses any form of magic done on someone without them agreeing to it whether it be for their benefit or demise. Wouldn't it be possible to do some sorta general ritual where you demand "things just get better for this person" nothing specific so you know you won't end up causing them problems thinking your helping. All you'd be doing is giving them a boost towards a better life. If you were proficient in psionics or whatever would it be possible to just go around causing changes for the better for everyone you run into? I don't see why not. I know I'd like someone helping make life better for me.