For a person who is "fallen" or in darkness, to be salvageable, they must first be broken. Pride is what keeps a person from accepting the truth of Jesus Christ, and there is none so proud as the wicked Nephillim, of whom the Lord said that it grieved Him that he had even created man, after examining the futility of a creature who's only passion and thoughts were of only evil continuopusly.
I was once a hard sinner, proud, manipulative, full of self admiration. But I too had to be broken first before I was any use to the Lord. Untill a person reaches that point then they are lost, and deserving of the fullest of God's judgement upon them. Compassion for sinners is part of our Christian calling. But there is a wide gap between Human lost individuals, and fallen Nephillim. I do believe that they can be saved, but it is difficult. They have to be broken to pieces, and in a place of total surrender to the Lord's will. And it is hard for someone who thinks that they are a god to humble themselves. God gives grace to the humble, but resists the proud.