It may not be the case that deliberate and intentional actions alone could have wiped out the natives but it seems pretty clear that there were a lot of deliber

It may not be the case that deliberate and intentional actions alone could have wiped out the natives but it seems pretty clear that there were a lot of deliberate and intentional actions both to kill them and take their land (Trail of Tears, Spanish conquests in South America). Those actions just wouldn't have been as successful without the diseases.