The Cat Eats The Mouse. The Lion Eats the Gazelle.
This sounds a little like Mother Goose. Those rhymes we learned in Kindergarten were meant to teach us basic truths.
Humpty Dumpty, for example, teaches us that government never can and never will fix the problems of societies and individuals. Quite the opposite is true. Humpty Dumpty's fall was caused, in the first place, due to the shoddy construction of that Government financed wall! Humpty had been bamboozled into thinking his government would always take care of him. When the government showed up to help Humpty, they were completely baffled. Just like our government trying to fix the economic woes with their T.A.R.P. T.A.R.P. is only creating a bigger problem for us all.
So, back to the topic of this thread. The food chain, survival of the fittest, moral reasoning, and self preservation give us the neccesity to eat both plants and animals in an expeditious and judicious manner. To do otherwise is to disrupt the circle of life thrusting evolutionary order into utter Chaos.