He was ALREADY deluding himself, and the Otherworld was bringing out the truth inside him. Why would this truth be another delusion and only have this revealed in a non-canon ending? It's dumb and bad, bad writing (of course, Climax are pretty bad writers, so whatever).I was thinking more along the lines of... Well, have you seen The Uninvited? Or A Tale of Two Sisters? In those movies we're seeing things from the viewpoint of the protagonist. It doesn't matter what we're shown in the movie, because it's not really what happened at all. We're seeing what the narrator is seeing, and since the narrator is batshit crazy, it's possible that we're being misled. The same thing could be entirely possible with Origins.
If the Butcher wanted to cause havoc, it could do so anywhere. Why choose to do it in a place that causes it mental anguish? Regardless, if Travis did have switches in personalities in his life, I think he would've mentioned, somewhere in the game, about having blackouts or waking up in strange places.But his bad side was desperate to cause pain. Homicidal urges and all that. Why would it want to stay away from the town that created that part of him? If anything, it would be the perfect place to come to create havoc.
That's a terrible, terrible excuse. Yes, the protagonist usually can't be trusted, but the truth is always revealed to them, and to us, before the ending of the game. SH1? Truth revealed before the end of the game. SH2? Truth revealed before the end of the game. Same with SH3, SH4, and SHH. Why should Origins be different by giving us a false truth, and then in a non-canonical ending you can only get on a second playthrough give us part of the truth in a really badly executed mindfuck?And remember Aura, the protagonist can't always be trusted. Just because Travis remembers it that way doesn't mean that is the way it happened. Travis could have very well ran into that room just before Richard hung himself and pushed him then warped the memory of it.
For example, has Mary really been dead for three years? Or does the game reveal towards the end that that simply isn't true? Well, the bad ending contradicts what we knew about Richard's suicide.
Like I said before, it seems you're not using existing evidence to draw the conclusion that Travis is a killer. You got the idea first, and you're trying to justify it and making excuses for the tremendous plot holes being created.