I see Kurzweil as a sadder figure: someone who achieved a lot as an inventor, and whose overblown prognostications about the future come (largely) from overestimating how quickly everyone else can improve technologies and adopt them. It's sort of a revenge of the mediocrity principle. If you are exceptional, assuming that other people are basically like you can produce disastrously skewed mental models of the world.

I'm reminded of the complaint that startups are disproportionately geared toward solving the problems of highly educated, able-bodied adults who have more money than spare time. "I'm like this, my friends are like this, and by the principle of mediocrity we're not unusual... therefore, iOS could use another food delivery app." You need to measure, rather than guess, whether you are unusual relative to large numbers of other people.

On top of that Kurzweil appears to have some good old fashioned self-delusion about death: believing he can "bring back" his beloved dead father as software, the life extension supplements, etc. (I don't believe in souls or uncomputable quantum woo in brains. I have no problem in principle with "brain uploads." I think that the obstacles in practice are extremely formidable and typically underestimated by people who have spent more time with computers than with biology.)