I'll take a jump and do some speculating... but first, here's the lyrics from Fading Away (
the first video you linked).
Kinda. To a certain extent, I think most of us fear death. I know that I've been reborn because of Jesus, and yet I'm still terrified of the day that I - a broken, sinful, dirty man - have to stand before Him. We all know that we're supposed to do the right thing, supposed to tell the truth, supposed to always react with love, supposed to turn away from our addictions, supposed to do a lot of things. And yet we fail... a lot. So to stand before One who has never sinned, never lied, never cheated, never failed to hold up his end of the bargain... I'm scared and ashamed.
Right from the lyrics: "This broken place (body?) that I call my home // Is deep in the sorrow that I have sewn". My life is full of things that I regret. But... "I pray that forgiveness is mine to keep // I know it's hard to forgive this man // Driving the failure into your hands" It's essentially part of the sinner's prayer. And it's written from a sinner's point of view. How can God forgive us for everything we've done, even when we keep sinning and taking for granted Jesus' sacrifice on our behalves? (Our continual sin is mentioned by Demon Hunter in the line "And i can't erase what is in my heart") I added the possible substitution of (body?) into the lyrics because I think it is a possible interpretation of what is being suggested. It's not the physical structure that I reside in... it's not my house on the street with the car in the driveway that's broken. It's me that's broken.
This is even talked about in Romans 7.
The particular Bible I have sitting here doesn't speculate who wrote which books, but I believe that Paul wrote Romans. So even Paul, who wrote incredible works through God admits that he sins. He went on in the passage to talk about how he knows that the only way that he can truly stop sinning is to die.... The same "final sleep" and "when I cease to exist" that Demon Hunter sings about.
Fear of death? Kinda. It means I have to account for all I've done. While I'm still here and alive in this body, that day seems so far away. I don't look forwards to judgement.
As for the 3rd link (2nd video), here's the lyrics...
There is all kinds of symbolism in the lyrics and the video. From my first read and watch through, it seems like the point of view is that of a person that's just heard the basics of Jesus' message - as he approaches his breaking point and nears the end of his life (whether his body is dying, or he wants to become a new man in Christ, I wasn't able to tell)
He needs someone to guide him through starting his relationship with his loving Savior. The longer we live, the more we realize the mistakes of our past - including fulfilling God's wishes for our lives. The dude in the video approaches his future with fear, crying out for help, because he never got it figured out on his own.
The second half of this post, I'm not certain on. I'm trying to interpret lots of meaning without any familiarity to the words, video, etc. Those are just random blurbs of my general impression. I hope it made sense...at least a little.