For those people, persuading them to indent can be the difference between them having a chance of learning the knack or just flailing randomly, getting frustrated, and giving up.
(The other lesson is: if you're building a DSL for non-programmers, try to avoid putting in nesting and make everything really flat instead.)
Some older books are the worst with indentation. Instead of learning to code you spend most of the time figuring out where the code block ends.
Or at least included a tool to fix it.
As with vim, this depends on being in the right major mode for the language you're working with, which should be automatic for most languages (except Perl, which is screwy, because of course it is), and depends also on that major mode knowing how to cope with the code and being configured the way you want, which should be reasonably trivial for most languages (except Perl, which is screwy, because of course it is).
But don't expect candidates to spontaneously criticize the interviewer's code. Yeah, I know, you want to work with people who can think critically etc, but at the time of interview you aren't coworkers and aren't on equal footing. Personally, if I as a candidate see you writing code with bad indentation I will conclude either (a) you were making a point about e.g. correctness or efficiency and didn't bother to indent because it's literally throwaway code, so mentioning the indentation would be a distraction; or (b) you and your team don't care about indentation at all.
hopefully someone will get around to adding more functionality to the plugin so i don't have to edit my visual studio formatting settings for parentheses/comma spacing whenever i switch projects :p