First, is that in no other text form, does white-space change meaning such that the text becomes "unreadable" (sure your docs may be formatted a little weirdly, but hey someone can still read it). Simple python is close enough to prose that people get confused.
Second, is that they haven't learnt to grok compiler messages - the program either works or doesn't work. Coupled with number 1, it basically means they can't /see/ any issues or fix them.