So are you saying that if we ever actually make it off the planet and go somewhere else we won't dramatically change that destination like we did with our own planet? Then what? We go somewhere else still leaving a trail of destruction behind us?
And sure most of our planets are just rocks floating in space, but do you think we'll stop there or do you think we'll eventually find somewhere with some weird green slime that needs eradicating. Or maybe we'll leave it alone, but the mega-kudzo vine that we brought with us will enjoy eating it
Then what is life anyway? Did the European explorers consider the people in the New World (tm) were actual people? or did they just think there was gold to be taken and the locals got int he way of the plundering?
Shall I mention Africa?