This means: You are not God, you have no right to make choices about other people's lives, and even if her mother is an addict, that doesn't mean you have the right to kidnap her child. If her child is unfortunate in the future, it is also God's will, and you should be in awe. You must be innocent and do not interfere in the will of God, because that is arrogance.
For the male protagonist, he has discovered this secret, so the only option to keep him innocent can and must be to send the girl back to her mother, and he is just the hand of God, unless he never knows about it.
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