WHy do Vegetarians/ VEgans eat fake meat?

I mean, if you want the taste and texture of meat. just eat meat.
why be so against eating meat only to pretend to eat pretend meat.?
explain please.
Update: I know why people don't eat meat.
but I don't understand why you have to pretend to eat the very thing you are against.
Update 2: and please note that I am not against any one's choices to not eat meat. I've tried that road before..
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