if veganism was a real problem we'd have it made, that's the least of our worries... americans aren't dying at an alarming rate from heart disease because they've been lead astray from vegans
there's been little change in overall meat consumption in the US for decades... and it's actually higher than most places in the world
But, if Americans ate more meat then the people who grow and sell that meat would make more money, and they would spend more of that money to lobby congresspeople to convince the populace to eat more meat so they would make more money so they would have more money to spend lobbying the congresspeople to convince the populace to eat more meat so they would make more money
I don't think veganism is a societal problem.. but I do think it's a personal problem. The vegans I've known that have done it for a long period have had all sorts of weird health issues that could be attributed to malnutrition (if they actually had labs done, which they generally don't). To be a healthy vegan you generally have to take a lot of vitamins or eat an impractically high volume, which to me suggests it's a bad diet (health wise. Ethically, great!).