Right?

Oh, look, a new continent! Let's kill nearly everyone on it.

Oh, look, a new planet! ...

Except that much of the world has culturally outgrown this kind of rape and pillage mindset. It's reasonable to assume that trend will continue as we enter the interstellar age.

Sorry but I think people from Iraq, Afghanistan, Yemen, Syria, South America until some 20 years ago and so on... disagree with you... at least for the pillaging part.

For the rape part you have what the UN been doing in Africa or central america.

Let's not forget the ethnic cleansing in China, similar cleansing of the Rohyinga in Burma, open slave markets in Libya, etc. etc.

Human nature hasn't hasn't changed, we just ran out of easy to settle real estate. And it's not cost effective to go after easily settled areas -- a couple of world wars showed how ugly that can get.

Once climate change starts changing things I'm sure we'll see yet more "colonization" and unpleasant behavior.

The bombing of innocents in those places, while tragic, is nowhere near the scale of the destruction of native populations that was happening a few centuries ago, and public outcry is also louder from the countries doing it. So the trend is in the right direction, wouldn't you agree?