I am looking for an alternative phrase to replace "what you don't know can't hurt you."
closed as primarily opinion-based by FumbleFingers, MrHen, Benyamin Hamidekhoo, Matt Эллен♦, choster Oct 23 '13 at 20:16
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The expression is most often used, in my experience, to justify not giving information to a superior. Usually this is to avoid potential damage if it subsequently becomes known that he/she was in possession of the full facts before a particular course was followed.
One infamous occasion when it was used was at the time of the Iran-Contra hearings by former US Vice-Admiral John Poindexter. He said that he did not inform President Ronald Reagan of certain facts, 'in order to allow the President a level of "plausible deniability"'. The term 'plausible deniability' did, however, go back to the Kennedy Administration and related to the CIA not passing on facts to the White House about covert activities in which they were engaged.
So my suggestion for an alternative phrase to 'what you don't know can't hurt you' is that you should say you are reserving to the other party the opportunity for 'PLAUSIBLE DENIABILITY'.