Search engines like Google do not see good or bad.
They see what it is seems to be relevant.
And we know how to create these relevancy factors.
Maintaining a positive online reputation should be a constant endeavor. The need for a good reputation can appear at any time. See examples:
Trying to get a special visa to travel
Applying for college abroad
Starting a Business
Preserving and protecting social and family status
Participating in public or private competitions
Concurring to elective or political offices
Developing a new business partnership
Getting a loan
Capturing representations and projects
Buying a home