The Martian Chronicles
—And the Moon Be Still as Bright (June 2001/2032)
The next chapter opens with the men of the Fourth Expedition gathering firewood against the cold Martian evening. The scientists have found that all of the Martians have died of chickenpox (brought by one of the first three expeditions)—analogous to the devastation of Native American populations by smallpox.
“I know exactly how I'd feel,” Said Cheroke. “I've got some Cherokee blood in me. My grandfather told me lots of things about Oklahoma Territory. If there's a Martian around, I'm all for him.”
And it's rather obvious that Bradbury considers it to be wrong.
“We Earth Men have a talent for ruining big, beautiful things.”
Comment: The last point is important. Even if colonization is unstoppable and inevitable, there's a right way and a wrong way to do it. Columbus and the Europeans who followed him did it the wrong way. As Pastwatch: The Redemption of Christopher Columbus showed us, they could've done it the right way.
For more on the subject, see No Natives in Science Fiction? and The Best Indian Books.