User blog comment:WilliamsonKnox/Villains of Mass Effect 4?/@comment-11209678-20150301172251/@comment-11209678-20150302005430

ME1 decisions are much easier to reconcile than having an entire race missing. The biggest decision in ME1, killing the Council or saving it, doesn't really create that big of a difference because the characters are simply replaced with similar ones. Every other decision in that game is pretty minor. The geth/quarian decision is very different though because it eliminates an entire race. You could get rid of both even if you killed the quarians and then chose the destroy ending.