Well, I dont think Seti is given over that far....he is simply in pride...probably has alot of his identity wrapped up in the dogma of Egyptian history and simply cant consider reality lest it destroy his own foundation.
Mt. Sinai in Saudi [Midian]: Yeah...It flows to comprehend that Moses would go where he was familiar. No doubt that during those forty years he spent away from the Royal family was in and around Jabel El Lawz in Midian [His Father in Law's backyard if not outright possesion].
He knew the terrian, he knew it could handle the population he was bringing with him. It is obvious this is where Mt. Sinai is located.
Folks with an agenda or warped sense of religion [doctrine] argue against this.
But according to the Bible, pride is
the spiritually incapacitating sin. It was the essence of the sin of the Fall. It is utterly ruinous. (It can even make a Christian temporarily
unteachable.)
In short, Adamic pride is a complete disaster. Apart from supernatural intervention, the person who needs to repent is by definition the one who won't repent. (The systematic theology of the entire mess is actually sadly funny when you see the big picture of what the Bible is actually teaching about the mess man is in. As Luther pointed out, the fallen sinner's will is free-and-yet-bound. The bottom-line point is that the Fall was a whole lot worse than most people realize. Lost sinners are in desperately serious trouble.)