For the sake of argument

For the sake of argument

Argument - a discussion for the purpose of making something clear.

Sake - benefit.

To introduce an idea 'for the sake of argument' does not mean bringing up an idea to provoke a flaming row.  It means introducing an idea into a discussion for the betterment of the process of making something clear.

Is that clear now?

Right! I don't want to hear any more arguments about it.

Credit:

Tip of the hat to the letter Aitch