User blog comment:LDR/Possible Reaper Motive/@comment-4237253-20120226053417

I hope we never get a full explanation. Like Lovecraft's Cosmicism (Upon which the Reapers and Mass Effect is based), you cannot fathom the true nature of the omniverse. We are insignificant on a larger scale, and the Reapers simply wipe the slate clean every 50,000 years.