Never is there any mention that by accessing the device of person A, the officer may be violating the rights of all people (say persons B, C, and D) who have shared information in confidence with person A.
This includes getting access to my family photos. I don’t want an officer, who self selected by applying for a job that he knows will give him access to family photos, to get access to my family photos, because what kind of person applies to that job?
There is not generally a right to confidentiality of information you share with a third party. There are a few exceptions (spouses, doctors, lawyers, among others). If party A shares information with party B outside one of these protected relationships, then I guess A's rights will not be violated if their information is discovered in party B's possession, whether or not party B shares that information voluntarily. (All subject to the search of B's information being constitutional.)
That really depends on the jurisdiction. For example in Germany it is illegal to share pictures of persons not being yourself without the other party's agreement. Google Translate does a decent enough job on the German Wikipedia entry:
This includes getting access to my family photos. I don’t want an officer, who self selected by applying for a job that he knows will give him access to family photos, to get access to my family photos, because what kind of person applies to that job?