While the animal products consumption per person has increased in the US, so have other factors such as stress, depression, loneliness, alcohol consumption and a sedentary lifestyle which all contribute to diseases. And if you pay close attention, the reduction of all these factors is what countries in the "blue zone" all have in common.
Actually, strict vegetarians when fed meat won't even produce TMAO, because they don't have the gut bacteria that produces it as its a meat-eating bacteria.
Note that depression is also linked to food consumption and impaired gut health, which is linked to a diet heavy in animal products.
In the blue zones, clearly the biggest factor is the diet which is almost 100% plant based. There is this correlation between health and plant-based diets everywhere.
In the US for example, meat eaters have higher body weight than vegetarians, which have a higher body weight than strict vegetarians. Actually, strict vegetarians are the only ones of those groups that have a normal body weight.
Clearly you are extremely biased and refuse to look at things in any other way but life doesn't revolve around "I eat animals or I don't".
Vegans aren't immune to cancer or heart diseases (they only have a small reduction of these in some studies) and they don't live 20-30-40-50 years longer than omnivores. And the reason vegans weigh less is because they're more aware of how much they eat compared to the mostly uneducated (in terms of nutrition) population.
Of all of them - taking excercise, drugs, alcohol, smoking into account - vegans live the longest and have the most optimal weight.