Why do people choose to be vegetarians/vegans?

If it's because of the way livestock is treated, would you have organic/free range?

My brother's ex-girlfriend was a vegetarian, but she didn't know why. It was just the way she was brought up.

Because of the way livestock is treated
For a religious reason
I believe it's wrong to kill animals, or use their produce
Other (please say)
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Why do people choose to be vegetarians/vegans?
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