Problem is, you are not alone on the road. And if somebody else does something really stupid, you can die as a consequence, without any chance to avoid it.
We are definitely not there yet, but I think of myself as a decent driver, and some assistant tools on high-end models are way better (just faster, probably) than me predicting stuff. For the first year this summer, I've driven a car that was quicker than I in an emergency break situation: while I started breaking, it depressed the pedal, and I was quite surprised, 'cause the car in front of me didn't begin breaking yet.