The doctor's creed is "do no harm" or "never do harm", even though it's impossible for a doctor to never ever cause harm. They have this oath because they want to be held accountable for their mistakes.
Doctors don't go around saying just "don't be harmful" or that as long as they have good intentions some harm is okay.
The simple fact is that formulation "don't be evil" is intended to avoid accountability. You can overlook some evil because you perceive them as having good intentions. Maybe you should consider that an advertising company may have put more thought into their motto and how it affects your perception of them than you realize.
Doctors don't go around saying just "don't be harmful" or that as long as they have good intentions some harm is okay.
The simple fact is that formulation "don't be evil" is intended to avoid accountability. You can overlook some evil because you perceive them as having good intentions. Maybe you should consider that an advertising company may have put more thought into their motto and how it affects your perception of them than you realize.