They did interviews with rapists and part of what they said was that they are looking for
easy access to remove clothing, so I think there is something to just saying "be careful how you dress" as a practical rule, but that should just be part of a larger list of things that women should do to protect themselves. It's a fine line though, because we as a society (and I don't think that Keith was doing this) keep putting the majority of our blame on victims of crime and saying that it is "their fault" that they were attacked, and as a result we have women who are not only mentally devastated, but on the whole less likely to report what happened and more of these assholes are still on the loose. Dress is not the primary reason that a rapist is going to choose his victim and without proper precautions it's not going to matter whether a woman is in a miniskirt or a blazer or a burka to someone who is mentally broken at that level. There's nothing wrong with saying "heads up", but we need to shift our main focus on fighting crime to the behavior of the criminals and not the victims. A cop should be giving a list of general safety rules not singling out one factor as an excuse.