User blog comment:Garhdo/Extended Cut - opinions?/@comment-1889545-20120627085017/@comment-1705621-20120627132201

It is explained by the Catalyst that Synthetics will be able to sympathize with Organics. Basically Synthetic Life (e.g: Geth, Reapers) will be able to feel remorse, emotion etc. That said, through the Synthesis ending, the player somewhat revives the civilisation that the Reapers were based on as explained by the kid.