They seem to be affiliated or at least in support of Earth First!, a radical environmentalist
group many consider akin to terrorists.

I note in their diatribe that they also use the old argument of sending people to other
planets will just pollute the Universe. They simply show their true lack of understanding
of how the Universe works and merely further reveal their agenda, which is to get rid
of everybody - or more likely, everybody but themselves and their closest friends.

By trying to make a dividing line between humans and the rest of nature, they also
show their lack of understanding - or caring - about how nature really works. Despite
our shinier toys, we are a part of nature, not some aberration. Their thinking on how
to deal with human expansion is the aberration here.

I also assumed that Gaia made humans so she wouldn't get hit by another big space
rock again. She tried with the dinosaurs, but they didn't get smart enough in time -
or they missed.