I think this is what it is all about. An ultimate twist, a cruel fate.
The Forerunners created the Flood and used it against the Precursors, wiping them out.
The Flood then evolved and turned on them.
Short, sweet, and to the point.
This is the act of barbarity described in Silentium.
Discuss.
[Edited on 08.29.2012 11:34 PM PDT]
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Nah, I think you've got it wrong. The precursors created the flood to test the ability of the forerunners in upholding the "mantle". A belief which is like taking care and responsibility for the galaxy.