If you accept that position, then we also should not eat....
- refined sugar
- fried food
- anything processed, really
- large amounts of meat
- large amounts of grains and grain products (corn, pasta)
- most people should not eat dairy (only 25% of humans are lactose tolerant)
- high calorie counts (we did not evolve in the midst of abundance)
- wine or beer
Somehow, I doubt all these Internet Tough Guys beating their breast about Evil PC Vegan Diets would enjoy a calorie-restricted diet, with very little meat, no chips, no beer. Just a guess.
As to the article linked in the OP: There's a reason why some of us know better than to take dietary advice from random 25 year olds with no training in nutrition. To start with, veganism clearly was not her problem; it was her orthorexia. An 800-calorie-a-day diet is not healthy, and not linked to being vegan. She let her website rule her life, another issue not caused by veganism. She had some kind of undiagnosed digestive disorder, and apparently instead of getting that figured out, chose to starve herself. (Hint: Don't trust anyone who claims food can "detox" you.)
As to the horrors of inflicting a poor diet on kids: Have you
seen American kids lately? Obesity is has doubled in children, and
quadrupled in adolescences, in the past 30 years (to 18% and 21% respectively); nearly 1/3 of children and adolescents are now overweight or worse. Shoving meat at your kids is not necessarily a healthy diet.
The key with
any diet is that it's balanced, provides a reasonable amount of calories, and offers proper nutrition. The issue is not that "vegan diets can't be nutritious," it's that you have to generally know what you're doing.