right but we aren't fitness maximizers. we're adaptation executors. http://www.overcomingbias.com/2007/11/adaptation-exec.html

for instance: we adapted to an environment of scarcity. now that we live in an environment of plenty a lot of people get fat. they can't turn off the adaptation to favor fatty sugary foods just because the environment has changed. similarly when encountering aliens adaptations that evolved to help us socialize with our own species may lead us to having strong opinions about the moral systems of said aliens. strong enough to take significant action.