No. Mechs were appealing to sentience. "We are sentient therefore we are living beings and you cannot kill us it's against the law." The anti-AI law was not enforced before Geth exactly because of pro-AI advocates who claimed that artificial intelligence is a form of life and therefore should enjoy all the rights. The Geth incident was a good example of what might happen - so the anti-AI law was enforced. But Geth were not the first AI gone self-aware and rogue in the history of the cycle. We have little lore data on that because it is irrelevant to the game's story - it was long before the humans even went to space.