Bakker summarizes his arguments (they’re good):
The first is a straightforward pessimistic induction. Historically, science tends to replace intentional explanations of natural phenomena with functional explanations. Since humans are a natural phenomena we can presume, all things being equal, that science will continue in the same vein, that intentional phenomena are simply the last of the ancient delusions soon to be debunked. Of course, it seems pretty clear that all things are not equal, that humans, that consciousness in particular, is decidedly not one more natural phenomena among others.
The second involves what might be called ‘Cognitive Closure FAPP.’ This argument turns on the established fact that humans are out and out stupid, that the only thing that makes us seem smart is that our nearest competitors are still sniffing each other’s asses to say hello. In the humanities in particular, we seem to forget that science is an accomplishment, and a slow and painful one at that. The corollary of this, of course, is that humans are chronic bullshitters. I’m still astounded at how after decades of rhetoric regarding critical thinking, despite millennia of suffering our own stupidity, despite pretty much everything you see on the evening news, our culture has managed to suppress the bare fact of our cognitive shortcomings, let alone consider it any sustained fashion.
Intelligence is not something humans have, but something they very occasionally catch a hazy glimpse of.