Just for the sake of the narrow minded, not every vegetarian is so because they are concerned about what died. Some are just physically repulsed by attempting to eat meat, they can't stomach it. Much like some of you can't stomach a particular vegetable.
humans by the way are "Omnivores" we are built to attempt to eat whatever was available be it vegetable or Meat.
I personally don't eat meat, fish or egg because I can't stomach it (literally I puke up) I'm not fond of the nature of eating meat now either, however it's based upon an understanding similar to what makes a perfect partner.
For instance in a partner we look for attractiveness, fitness and the ability to reproduce. If I could eat meat, I'd understand that the ingestion of the genetic material potentially passes certain traits across to me and potentially effect my genetics in the long run. So I'd want to eat something that was fit, wasn't too fat and was by definition clever.
Currently most of you meat eaters are happy chomping on a lard fest of a burger which was the makeup for about 5 cows backsides. Most of those cows are forced to be Fatty, overweight, they suffer a number of diseases like infected teat's and bacteria laiden mucus. Technically if you saw the state of what you eat, you might give it a second chance of life, if only because it's not palletable anymore. Also they are obviously pretty stupid, they stand in a field all day eating grass covered in their own diarrhoea without even the smallest of inklings in regards to their eventually demise and re-incarnation at fast food outlets.
I guess you can say the equivalent if you were looking for a partner would be an extremely old overweight street hooker with every disease under the sun.