There's no reason to think robotic beings would have a humanist morality (that fits much closer with Purity), free will and rights just aren't logical metrics.
But yeah, for vcs it seems Contact is the most pacifist one. All the others require a measure of military, production, and technology. In fact, I think the Purity victory will be the most militaristic in practice, if not in theme, because it forces you to find living space for all the new colonists.
I vote for wormholes being our mode of transportation. However, I don't think it's far fetched for colonies to become more advanced than their motherland. The most analogous parallel in our own history, settling of America, had a few rag tag religious fundamentalists, and other undesirables going from freezing in the cold to a industrial powerhouse that completely dwarfed it's mother country in 200 years. BE scenario is even more extreme. Earth is old Europe, except it doesn't have colonies feeding it raw materials and new substances to promote its economy or sciences. It's constantly sending the best and brightest (not the worthless) away on colonization efforts with no immediate return. No communication means earth learns nothing about how floatstone reverses the laws of physics (imagine if Europe didn't learn about the discovery of electricity, or the invention of the light bulb). The colony has access to a world entirely unexploited with resources beyond our wildest dreams and alien life to research. I'll be honest, just based upon what we've seen and what we're proposing, old earth doesn't stand a chance.
--this be comin' from my cell pho' yo, so plz be up an' forgivin' any mizzlesteaks and breaks (galaxy s4)