Playing Geneforge as a pacifist is like going to Jurassic Park/World, but staying on the boat the whole time. Yeah you won't get eaten by the T-Rex (which to me kinda feels like the whole point of going, since you're actively tempting fate at that point), but you also don't get to see a whole lot. That is to say, in a game where you can make fire-breathing velociraptors, shoot lightning out of your hands, and become a literal god of death, restricting yourself into pacifism feels like it's missing the point. It's like going to your own pizza party, only to eat the salad.
With that