Some snippet of Jon Steinberg interview from Fathoms Deep on Silver's background (probably someone showed before but I hadn't seen one):
Steinberg: No, I spend a lot of time thinking about it. I think– I don't think it's that he doesn't have one [backstory]. Everyone has one, and I think, when I watch it, the clear implication is that his is awful. Which if– I think, if this story is going out of its way to suggest it's unspeakable, considering the things we have spoken about, I, as an audience, I think, am willing to take its word for it, I guess, is I guess a way of putting it, that if you are invested in that character and you understand where all of the norms are set for the show, for someone to say “I can't say it out loud” suggests that it really is awful. And we played with versions of what it could be. In the moment you name it, it just becomes less scary.
And it weirdly becomes– there is some instinct to explain it, to rationalize it, to suggest it's his fault, to suggest it’s someone else's fault, to suggest it could never happen to me. I think it's the “it could never happen to me”, maybe, that's the most destructive to the story we were trying to tell, that it had to feel like he was everyone and that requires him to kind of be no one at the same time, which sounds like bullshit, but I don't think it is, I think– the less specificity he has, yeah, the more you can see in him what you need to, and so– and it also felt right.
This is one of those moments that I think it depends on how you turn it, it will look different, is that it is clear, I think, from the first frame of season four that there is a point at which these two guys aren't connected. It takes a little while for that to get said in text but it's clearly Flint's concern, and I think on some level Silver's aware of it, and it was it felt both meta and interesting to me that the point at which they were not connected is how they feel about story and how they feel about their obligations to it, their place in it, the burden of it. They just don't agree that there is some need to create stories to explain things, and that that ultimately is the death of that relationship, that they– because they have that discontinuity between them, they– that is the thing from which everything else unravels, it's the thread of the sweater. So, you know, that felt right, too, that we were able to kind of strangely name something you didn't think you were looking for a name for, which is the space between them and not, you know, specifically who did what to Silver when he was a kid. [...]
I think it suggests the horror from another direction, that whatever happened was so terrible that it broke his ability to exist within a story. There is something that is therapeutic about existing within a story and something that I think is normal and also a part of the human condition, to find a place in a story in which you feel like you make sense, and I think whatever it was that happened to him that made him incapable of reconciling that, that is his trauma, you know? His backstory was that he was removed from his own story.