Err, eating meat is our biological instinct. People abstaining against meat is actually only a recent trend over the human timeline. Murder, mutation and other aspects of our behaviour have nothing to do with it. Learn a little before posting crap.

Eating might be selfish, but necessary. Abhorence is in the eye of the beholder, so equally selfish. But not necessary.
Have you fallen into the 'apples come from trees therefore all trees have apples' misconception? Mankind has been doing many things for eons - good and bad - because some are bad is no reason to suppose all are.

A better line would have been, we EVOLVED due to eating cooked meat, do some research. Be a vegan all you want, but realize that you would not exist if it were not for the proteins created by cooking meat.