The Precursors [i]could[/i] defend themselves, but instead chose to study the chaos of war rather than fight back. Their minds do not think as ours. To them, death is an inconvenience, proven in how they resurrected themselves with such vigor.
And the new civilization that was mentioned was put there, so far at least, only to emphasize the slaughter of the rings, that an infant civilization just now looking to the stars and wondering what lies out there...is simply crushed by the all powerful might of the Halos.
English
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Also, the Precursors can't even die. From evidence collected on Space Battles, they appear to be Eldritch Abominations older than our universe (either successors of the previous universe or from the multiverse) that are incapable of death, beyond time, and possibly use physical avatars as means of interaction. Therefore, the Forerunners merely killed the shadow, not the caster.
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Mind linking this evidence?
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"resignation is our virtue, like water we ebb and flow. Defeat is simply the addition of time to a sentence we never deserved, but you imposed" suddenly that line takes a whole new meaning