Well, I am not the former. And here's a lecture for you: comparing human beings to diseases and insects subject to eradication is plain old racism when the latter do it as much as when the former do.
You know what is totally, totally irrelevant here? Your (incorrect) presumptions about my nationality and ancestry.
"Racism" in popular usage includes ethnic and religious hatreds ("racism against Muslims" etc.). I agree this usage is sloppy. Would "virulent bigotry" be more precise?
Suppose for argument's sake your claim that nomads "would gladly enslave your ancestors and congratulate it [sic]" were historically supportable -- let me lay out for you why your "malaria/tsetse fly" comparison is still plain old unilluminating bigotry. In short: a) you can generalize tsetse flies and malaria organisms but not human members a group; b) you can relate to the latter, but not the former, on human terms.
Were there periods of positive coexistence between nomads and settlers, and were there cases of successful peace agreements between the two during conflicts? Were there members of nomadic ruling elites who championed or protected sedentary subjects from their peers? Were some nomadic people themselves slaves, religious ascetics, children, etc. who would not "gladly enslave" anyone? Did some nomads even transition to sedentary life? Do they have human descendants alive now? The answer in each of these cases is a well-attested "yes". Do any of these cases apply to malaria or the tsetse fly? No.
By comparing a human group to parasites or vermin, you can generalize them and dismiss any possibility of relating to them on human terms. If some group would gladly enslave me, I'd have no problem condemning it or resorting to force. But unless I mainly wanted to enjoy treating them as inferiors I wouldn't liken them to diseases or insects like you are doing.
Nomads did make these lands uninhabitable due to danger of death, not unlike malaria; and these lands did undergo the relevant nomad displacement/swamp draining before they could be settled by peasants. The comparison is apt, and if you have moral issues with the metaphor, compare that to moral issues with raiding and slavery.
