Computers are a problem. They are expensive, even if the prices have dropped dramatically and promise to continue dropping. They do not look after themselves but demand considerable attention - we have to hire computer specialists to ensure they talk to each other, staff are required to make sure software is installed and to fix things when it no longer works. Learning to use them is tedious, skills have to be developed to master several idiosyncratic software systems. The hardware and software regularly malfunction. It is faster to draw a line by hand than with software. Students already have enough trouble learning how to stop a window leaking or ensure a fire escape route will protect people in time of trouble, why make them learn all these other things. We should stop teaching CAAD. Although technological and economic issues are very real and not to be dismissed lightly, the real problems of teaching CAAD are not these. The real issues we need to address is how we teach and, behind that, why we teach. This paper explores the what and why.