There's a fine line between fact and opinion; the former is not the latter, and the latter is not the former. Therefore this argument is pointless.
And that is the truth.
You don't understand the gravity of what reaching the Dark Tower means to the truth--
Jake Chambers was a boy that was pushed under a car in New York, and he died. After his death, he was transported to End-World, where Roland the Gunslinger found him, and took him on his quest for The Dark Tower. Under the mountain, Roland met his nemesis: Martin, Walter, Randall Flagg; The Man in Black. Due to his obsession of the tower, Roland let Jake fall to his death.
Skipping forward, Roland has entered a doorway to the mind of the man responsible for Jake's murder. He stops him from killing Jake, causing a temporal paradox. This is later resolved by Roland allowing one of his ka-tet to be raped by a demon so he can draw Jake into his world once again.
Jake eventually sacrifices himself to help the ka-tet reach the tower, but a ka-tet is bonded via mind, so Jake's truth is the ka-tet's truth, and Roland reaches the tower, forever setting the truth in stone.
CHECKMATE brother