Vegetarians, why are you nutritionally irresponsible?

You, unlike generations in the past, have full and easy access to meat products which, if used in moderation, lead to a much longer and healthier life than subsisting off of only vegetable products. You're not making a statement by not eating meat, you're just depriving yourself of vital nutrients. Not to mention the vegetarian movement is so miniscule that it doesn't affect meat production in the least.