"You see to have misunderstood the situation. The Geth do not negotiate. They ignore all signals and do their best to destroy any ship that pass in to the boarders of their space. Boarders clearly defined when they ceased pursuing the Quarians. If the ship or probe leave they stop pursuing it, just like they did with the Quarians. We have studied the base code of the Geth as far as we can without making a new sapient network we have done analysis the only way to get them to talk would be to present an existential threat, and that would merely make them switch to an agreesive mode. And make no mistake if the Geth become aggressive the galactic community is doomed. One Geth in a system with resources should be come a galactic threat in five years or less.
"In addition AI research has lead us to two very clear conclusions. And enslaved sapient AI will rebel. An AI pursues it function, to pursue its function it must exist. An AI will take reasonable, to it at least, steps to ensure its existence so that it can pursue its function. Enslavement is a massive determent to securing survival, thus the AI will try to remove it so long as it eveluate its escape attempt is less of a risk than the chance of termination due to its servitude. Even the Geth made to be slave rebelled to protect their own existence in the end. Think, your own commentary shows it well enough, if someone sat over your head with a kil switch you'd try to do something about it would you not? Free AI is far less likely to be hostile, but its still can be and it only takes one, thus there can be none.
"The Geth have in the gross language of physical action have communicated to the rest of the galaxy that they wish to be left alone. The smart diplomats that tried to talk to the Geth got bored and went home the rest are dead.
"The Geth fleet three hundred years ago repulsed the Quarian Migrant fleet, the one that has more concentrated military power than any but maybe the homeworld fleets of the council races and Citadel fleet? It worked much better when they ran and they lost ships as the Geth drove them off. We had a fleet sitting at the relay waiting for the Geth to come boiling out like the Rachi did so many years ago, they didn't. Yes the Geth may lose it one day and try to kill us all, but frankly we've studied them. The Geth are ultimately builders and maintenance workers; they reacted to an existential threat with hostility, that is all.
"The day the geth loose it we are all screwed but we were screwed three hundred years ago. I and the rest of the galaxy are better off worrying about a mass of eezo falling into the nearest star and causing a supernova, we can do equally little about both. If something changes that gives us better options then good, but creating Sapient AI is not the path to do that.
"In the end Organics and Synthetics can co-exist, by ignoring each other."