If you do something for the sake of
something, you do it for that purpose
or in order to achieve
that result. You can also say
that you do it for
Let's assume for the sake of argument that we manage to build a satisfactory database.
For the sake of historical accuracy, please permit us to state the true facts.
For safety's sake, never stand directly behind a horse.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers