Especially since the prophetic Scripture is unfolding just as God said it would, right in front of our eyes, the inability to see the signs Christ gave for His return is, just like you wrote, willful spiritual blindness.
As for denial of God-given Biblical doctrines like the Rapture, that's simply the natural, unredeemed man who cannot understand the things of God. Also, if Biblical doctrines like the Rapture are true, they're doomed, so they have to deny the Bible for self-deception purposes.
INDEED.
More than a little plausible, to me.