"you can and must understand computers now"

This picture showed up in Michael Curry's talk tonight:

It's actually the cover of a book by Ted Nelson: Computer Lib (1974).

Why do I blog this? I was impressed by the "you can and must understand computers now" claim there, which definitely show the underlying values that pervaded our culture. The "understand" word is tough though, but as Nelson pointed out, people have resources to do so ("can") but also an obligation ("must")...