User blog comment:ChaosEnforcer/Geth Reaper code/@comment-4950455-20121026230811

I think people are misunderstanding the question. The issue isn't why the geth originally accepted the Reaper upgrades, but why Legion/the Geth VI decided to use them to bring the geth to full intelligence after being freed from Reaper control, despite the fact that this seemingly goes against the original true geth ideology.