Although a thing may not be bad in itself, yet, if it is of bad example, it is not to be done.

Explanation

(English-origin maxim.) Even lawful acts should be avoided when they set a dangerous precedent — the law considers not only the immediate effect but the example set for others.

Where this applies

• A judge who privately meets with one party to a case before trial has not technically broken a specific rule, but the bad example could undermine public trust in the courts.
• A mayor who hires her own relatives for city jobs may not violate a specific law, but the practice sets a precedent that invites corruption.
• A police department that uses a legal but controversial surveillance technique avoids it anyway because widespread adoption would erode civil liberties.