"This admission of the imperfection of some parasites does not console their victims, however. The situation is relevant in assessing the adequacy of unconditional positive, sometimes highly emotional utterances about nature. What do human beings do when witnessing animals in what they think is unnecessary and prolonged pain? Those who intensely identify with the victims try to rescue them, provided it is not too late and a practical way is seen. The rescue may involve merciful killing by human hands. Generalized, and made into a policy, rescue attempts would amount to an attempt to reform nature. Not everybody studying the consequences of such a policy will accept it as desirable. Because it is totally out of our reach completely to eliminate prolonged extreme suffering, it is of no practical value to discuss its ethical status, but its existence makes general glorification of nature strange to many of us."