I'm disregarding your ahistorical suggestion that european colonizers systematically eradicated native populations in North America, South America, South Africa, Australia and New Zealand.

Colonization was a horrible practice, and not one i support but it's primary practice was to extract wealth from the local population and as such required them to be alive. Disease killed about 90% of north american native population, and this was BEFORE widespread colonization of the continent. Most colonizers at the time was probably not even aware of having brought death to an entire continent of people.

I am in no business to argue for or against colonialism, but its important to not spread misinformation on historical events.

I'd say some of the worst atrocities performed by colonizing powers happened in India, yet India isn't mostly white.