We are approaching a point where we could quite conceivably tailor life forms that could live, thrive, and evolve on worlds and moons other than Earth.

I'm intrigued by this as an ethical/moral question.

Some argue to spread life outside of earth would be pollution and contamination. In yet, on earth we hold life and all lifeforms as the most wonderful and precious thing. So why not spread life past earth?

I can see the argument, than until we've searched a place enough to establish life doesn't already exist, we may be inadvertently destroying alien life. But what of places devoid of life? Must they be kept that way.

There is also worry that given the long term we can't predict the outcome. So what? It seems hugely exciting that we could seed life to evolve and adapt in parallel to ourselves.

And on that, what if we could help change places to make it more approachable for man-kind? What if we could make something hardy enough to live in the outer atmosphere of Venus and slowly diffuse the greenhouse effect in place.

Is it so morally wrong to make the universe suit ourselves? Otherwise who are we keeping it pristine for?