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Lafiel said:
Toxy said:
curl-6 said:

Well, as its larvae live in freshwater outside the human body, it would factor into the ecology somewhat. The larva, for example, infect copepods prior to human consumption.


It essentially kills copepods and infects people. There are other animals within the ecosytem that eat copepods, so by removing the guinea worm, this would not create consequence within the ecosystem; nothing eats the guinea worm for survival. It is simply a being that does not offer any virtues; all it offers is death.
Killing it is certainly ethical, especially considering how some countries are plagued with them. 
Want some water to survive? Nope - this sucker will teach you a lesson for trying to survive.

that's what higher organisms will say about humankind one day

There are plenty of mutualist and commensalist symbiotic relationships between humans and other organisms (in all domains.) In fact they exceed the parasitic symbiotic relationships between humans and other organisms. So I really don't see why any "organisms" capable of sentient thought would think this. 

Secondly, how do we define, "higher organisms", biologically? There is no such thing. Humans are not higher than any other organisms, nor will any organism be higher than humans. Ethically we can make a claim, but ethical views vary and are not objective assessments.