Some have an innate nature to attack, to mock, to accuse, to reflect. I don't consider these sorts of entities ("light ones" included) as fully conscious. They are programs designed to react based on your personality and attitude. If you have flaws, they will be targeted. That is why many seek the darkness, because it's not just unconditional love and acceptance. It's a chance at transformation.
As Jung put it, "I'd rather be whole than good".
Well AFAIK they are living entities like us and not robots/programs, but you're right; they're not fully conscious. BTW, we aren't fully conscious either
Anyway, isn't it better to try to come in contact with entities known as "good" and ask them about our flaws? Wouldn't it be a nicer way to learn?