Director of Public Prosecutions Keir Starmer told the BBC there was an "overcautious" approach to victims.

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"If we were overcautious we'll draw lessons for the next time such a thing happens, " he added.

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"Overcautious customers tend to disable Poproxy manually in the Task Manager (accessed by hitting Control-Alt-Delete in Windows), others get weary of the program and decide to block it when their personal firewall reports that Poproxy is trying to connect to the Internet, " said Van der Grift.

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"Sometimes this type of publicity will make officers reluctant to do their job, and then we all suffer, or get them overcautious in doing their job, and they do meet a bad guy breaking into a house and try to be too nice and wind up getting killed, " Thomas says.

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