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Personally, I don't see what the big deal is. If you can justify eating meat, do so; if you can't justify it, well...
As a veggie I have to justify myself at almost any group meal I attend. "Why don't you eat meat?" etc. Then after cajoling me into talking about it, they get defensive ("I don't eat that much meat, really.") and angry. It's a pattern that is repeated at every public and family function I go to. All of my veggie friends go through it. Yet any veggie who does the same to a meat eater is considered to be abusive or harassing. It seems unfair to me.