Didn’t the first documented cases of this occurs a hundred of more years after most of the natives had already died (18th vs the 16th century)? By the time Europeans started colonizing NA most of locals had already died to the diseases spreading from the south.
I acknowledged that much, but my point is they had no idea that these “new people” had no immunity and that the sickness would tear through the population so effectively. Moreover, “they” isn’t “all Europeans”—we need to be careful who we blame or else we verge on racism ourselves.