Yeah, this is a great point. Both overly defensive programming and (my personal least favorite) overly-commented code are instilled in students at a very early

Yeah, this is a great point. Both overly defensive programming and (my personal least favorite) overly-commented code are instilled in students at a very early point in their careers by irresponsible teachers trying to find something to grade students on (Didn't handle negative values? 5 points off! Didn't leave a comment on every line? 1 point off per line!)