Every colony on earth was blood bath because someone was already there, and didn't appreciate their land being taken by force.
Mars has no indigenous population, and seems to be plenty big enough for everyone.
Mars has no indigenous population, and seems to be plenty big enough for everyone.
What makes you think the interaction between the first and second wave of colonists wouldn't run into all the same problems that we had on Earth?
(Not that I believe there will be any waves of colonists. It'd be easier, and have a better social ROI to make the ocean floor, Antarctica, Mount Everest, or San Francisco hospitable to human life, than it would be to settle Mars.)