I know this sound optimistic but I think Shaner's writing is really doing him a disservice here and making him look dumber than he is. (Please stop laughing and read the rest). I think we all know a few (usually older) people who seem well-spoken and intelligent enough IRL but type like fifth graders and look like fucking idiots online. Shaner is a more extreme version of that. IRL he's stupid, but not as stupid as he comes across online, while he's suffering from Developmentally Delayed Typing Syndrome (couldn't think what else to call it). The end result ends up looking like a mentally retarded kindergartner wrote something and ran it through google translator a few times, when really, IRL, he's slightly more competent. Not much, but slightly.
Add on to that what I mentioned earlier, that he's possibly aware of how obvious his sockpuppets are to others and tries to change his typing style but doesn't quite get it and just mangles syntax instead. So that's how we get a person who has enough intelligence to operate a computer and multiple accounts but writes like he does. If he was more competent at typing he would be more like any other lolcow who tries and fails at sockpuppeting and related shenanigans

which in itself isn't too unusual.
He's pretty much the winning combination of dumb, incredibly egotistical, and autistic. The conspiracy stuff does sound pretty whackadoodle though. And you have a good point about his lack of comprehension reading posts. Maybe he just wants to keep denying it. maybe he sees your posts and they kind of make sense so some part of his brain shuts off.
Definitely shades of iconoclast here. Iconoclast at least used to respond to people even if it's the same shit (the liberals hate me because I tell it like it is!!) and he believed he got kicked off the newspaper for the same reason. What could possibly make Shaner think all the railroads in the area banned him for no reason? Why would they make a random conspiracy against an old man? Most lolcows have some kind of excuse, eg. others are just jealous, everybody loves playing kick the autistic, everybody hates trans latinx, and so on.