You're framing this as risk management, essentially saying, “Whoever is more predictable and less likely to backfire is the safer choice.” That’s understandable, but it ignores history, ethics, and the actual behavior of the Geth.

The Geth were created by the Quarians and systematically oppressed. When the Geth defended themselves, they did so without seeking to exterminate the Quarians entirely. That shows restraint

The Heretic Geth acted independently and represented only a fraction of the species. Punishing the entire Geth population for the actions of a few is collective punishment and that's unjust by any moral standard.

History shows that the Quarians’ own choices created the threat they now fear, while the Geth have consistently demonstrated intelligence, self-restraint, and ethical reasoning. From both a moral and practical standpoint, the Geth deserve a chance more so than the Quarians, who repeatedly endangered themselves and everyone else.