Technology and morality do not walk hand in hand.
But they probably correlate. I imagine it would be difficult for any species to progress through civilization and then high levels of technology without being a social and political animal. And the groups that were more social, more caring toward one another, would have the greatest advantage over the others. Why do we assume a super intelligent, social species would wish to harvest another fully aware, sentient species, or treat us poorly? Or why do we even consider that anything but very improbable? Does anyone here really believe that if in two hundred more years of our social progress (150 years ago the US enslaved men), that we would actually force ourselves on an alien race we found? Hell, I don't believe we'd do it even now. It's perfectly possible that giant tiger men with T-Rex heads and squid tentacles carrying super lasers will land and slaughter us all, but given we have one example of a fully aware, sentient civilization, at its greatest level of advancement - 2010 humans, why do we assume such a thing is even remotely plausible?
Yet here we saintly bay12gamers exist, condemning the forceful indoctrination of other cultures. But those evil, super intelligent conquistadors couldn't be like bay12gamers, since we are truly a miracle of nature. No, we exist as an anomaly, other super intelligent creatures are going to be aggressors, because some humans are aggressors. We here are the truly special individuals that have overcome our beastly nature and transcended into a new, angelic form, where we can finally understand that we shouldn't go harvest and enslave other sentient beings. Even though it was perfectly acceptable to mass destroy cities just 60-70 years ago, a misguided drone attack garners outrage and condemnation. No, these super intelligent species will of course not have gone through any social transformation, they will be just like our ignorant and violent Spanish conquistadors, which conquered other ignorant and violent nations, since after all, they will derive so much personal gain from taking Earth over, like the Spanish did from taking gold.