"The choice is yours." The Catalyst concluded, stepping back to let Shepard decide.

He paused.

"Question."

"Go ahead."

"This pulse can destroy all synthetic life?"

"Yes."

"And there are absolutely no fail-safes against it? Not even for yourselves?"

"Correct. Not even the Reapers can survive the pulse."

"Then… if this pulse can destroy all synthetic life… why don't we just use it whenever synthetics threaten to destroy all organic life?"

"… What?"

"I said why don't we just use this to wipe out the synthetics whenever they threaten to destroy all organic life?"

For a brief moment, all the Reaper forces across the galaxy paused.

"… J-just pick an option, Shepard. It is not a thing you can comprehend."

"Apparently I'm not the only one."

Fin

Note: Just because you're a Paragon, that doesn't mean you're also an idiot.