dspeyer comments on Arguments Against Speciesism - LessWrong

28 Post author: Lukas_Gloor 28 July 2013 06:24PM

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Comment author: Lumifer 29 July 2013 08:14:27PM 10 points [-]

We can imagine a continuous line-up of ancestors, always daughter and mother, from modern humans back to the common ancestor of humans and, say, cows, and then forward in time again to modern cows. How would we then divide this line up into distinct species? Morally significant lines would have to be drawn between mother and daughter, but that seems absurd!

That's a common fallacy. Let me illustrate:

The notions of hot and cold water are nonsensical. The water temperature is continuous from 0C to 100C. How would you divide this into distinct areas? You would have to draw a line between neighboring values different by tiny fractions of a degree, but that seems absurd!

Comment author: dspeyer 05 August 2013 02:14:39AM 0 points [-]

The usual solution involving water temperature is to have levels of suitability.

I want to shower in hot water, not cold water. Absurd? Not really. Just simplified. In fact, the joy I will gain from a shower is a continuous function of water temperature with a peak somewhere near 45C. The first formulation just approximated this with a piecewise line function for convenience.

Carrying the analogy back, we can propose that the moral weight of suffering is proportional to the sentience of the sufferer. Estimating degrees of sentience now becomes important. ISTR that research review board have stricter standards for primates than rodents, and rodents than insects, so aparently this isn't a completely strange idea.