No, they don't say that they it is safe and appropriate for all stages of life. They say it can be. That comes with a long list of caveats related to common nutritional deficiencies...some of which are far more serious for some people (such as pregnant women and children) than others. Addressing those deficiencies is hard to do for all people for a multitude of reasons, some of which have already been listed.

Again, speak for yourself about morality. I feel no moral obligation to not be an omnivore. I do feel a moral obligation to pass down my culture to my children.

Any diet can be unhealthy. Regardless of whether or not you’re vegan you need to ensure you’re getting your vitamins and minerals.

And it’s not very difficult to get those on a vegan diet. There are LOADS of resources to refer to. For example: https://www.nhs.uk/live-well/eat-well/the-vegan-diet/

Yes, actually, it is.

Omnivorous diets can be unhealthy, but not due to nutrition deficiency. The problems with those diets are all solved with moderation. Vegan diets have to deal with nutrient deficiency. Filling gaps in nutrition deficiency takes targeted food intake or supplements. Those aren't always available or cheap. People have food allergies that can eliminate them as candidates. They are hard to incorporate into existing diets and available foods.

I find it a lot more morally objectionable that your privileged culture-less self would pretend to know what's better for the rest of humanity than they are capable of determining for themselves. There's a reason people who care about food refer to vegans with names like the "Hezbollah of vegetarians". You're not diet advocates, you're religious extremists.

A diet is not implicitly nutrient complete simply because it contains animal products. You can still easily miss out on nutrients. All diets require ensuring that you have access to important vitamins and minerals. Like I said and showed, you can get all these things without eating animals products.

You’re saying that I have no culture and that I’m a religious extremist (which seems contradictory a bit) for saying that you can get all the vitamins and minerals you need from non-animal sources. That seems a little disingenuous and ad-hominem, no?

No, you're a religious extremist because you're telling other cultures that they need to change in order to fit your belief system.

Calling someone a religious extremist because they think an act is immoral seems to me to be watering down the phrase "extremist" to a useless degree.

Good luck with life, friend, as you're bound to encounter many other "religious extremists" if your POV is so easily challenged.

I don't give a shit that you think it is immoral. I give a shit that you are labeling cultures as immoral and that they need to change to fit your belief system. And yes, I see that as no different than Fred Phelps' ideas.

And yes, there are far too many religious extremists in modern society. Maybe stop joining them.