Keshen explained his ethical objections.
He rejected the idea that the method was necessary to meet the population's increasing demand, explaining that animals in have to eat food grown explicitly for them, and they burn up most of the food's energy just to breathe and keep their bodies warm.
Singer himself adopted utilitarianism on the basis that people's preferences can be universalised, leading to a situation where one takes the "point of view of the universe" and "an impartial standpoint".
Select to meet the vender face to face instead of making on the web exchanges.