I have done much research on the original film; there's a lot more "there" than most people realize
in the film. I'd advise to seek out the old interviews with both the star and the director to start...
The original had scenes cut out even in the "UK version"; that's a whole 'nother rabbit hole to fall
down, too.
Yes, the version with Charlotte Rampling is the only one that matters.
No, the remake with Viggo isn't terribly good by comparison - but there's obligatory Mopars a plenty in it.
It was made for very different reasons than the original, though - and for TV. Big difference.
The "true message" of the original is debated ad nauseum and has been for a long time, but for
me - at its' core, the movie is a story of a typical good guy who has spent his life trying to do what's
right, only to have diastrous results every time through no fault of his own.
He's suffering PTSD from Vietnam; he's suffered the loss of his true love too and he's about eat up
with all of it being an exercise in failure despite his doing what he'd been taught was "the right thing".
Heck, he even loses the last person on earth who's actually trying to help him (SuperSoul).
In the end, whether or not he believes he's going to make it through the roadblock doesn't matter -
on the surface, perhaps his depleted mental state might lead him to believe he will, but deep down he knows
he's not going to and the light between the blades is his ticket to heaven - and finally, some peace.
Now you know why I'm such an afficionado of the original.