Why, exactly?
I know Gods word, I know in the end times, the closer we get the final chapter of Gods will for the people on this earth, there will be many, masked in sheep clothing, that seem like Good People. Yet, many may be pretending. And many may be real.
God isn't going to punish us for being too discerning. I'd rather walk thru fire, and recieve Gods healing waters; than to embrace that fire, and have to ask God to forgive me.