The studies are there, many have been done by the police, government and councils who have no interest or dark sky agenda. Most do factor in the times seeing as that is the point of the study to begin with. These switch offs are not designed for a reduction in crime nor are they designed for astronomers and when the public start crying their fears about increased crime the authorities ran their own studies and found the results surprising themselves.
The numbers don't lie about it and even in some cases the results are mixed but it doesn't show increased crime rates, I'm afraid lights or no lights crime is probably something we will still have to live with.
Here is one from Oz that tells how crime fell during powercuts.
http://asv.org.au/lpoll/lpdoc.htm
To be honest most people would be happy for a light shield not a turn off and that is a fair solution which also allows the public their street lighting. What is not acceptable is to be told to "buy thicker curtains".
I'll also add I'm in no way supporting the vandalisation of public property even if I can understand where the feeling one may need to do that comes from.