Quite possibly, this is the cruelest thing that you could do to someone. Particularly when you don't understand it or only know part of the truth (at best), anyway. Let people live; let people learn. (Those are not my words but well said.
The one who walks with the crowd will usually get no further than the crowd. The one who walks alone is likely to find himself in places no one has ever been. the one who walks with God gains EveryLastingLife!