The argument for it is obvious. 

 It makes it easier to convict and jail criminals and will encourage them to commit their crimes in other cities if they know that they are being taped.  

That is why we have the push for police officer cams on them and in their cars; to provide accountability for police and those with whom they interact.

Big brother is already watching.  The stupid (bank robbers, for example) will still commit crimes.  They will then plead guilty when they and their attorneys view the tapes.

Those on the tapes who are not committing crimes will be unaffected other than their personal angst.