There is a lot of fighting amongst people with differing views on healthy and sustainable diets, particularly around the role of animal-source foods. But I think everyone can play a role in achieving diets at the population level that are good for human and planetary health. 
Vegans are already playing an important role by advocating for animal rights and planetary health. Some could do a better job by ensuring their diets provide nutrient adequacy (using fortification and supplementation when needed), moderating intake of ultra-processed foods and...
...when possible, choosing foods that are produced using regenerative and sustainable production practices, like diverse farms. Just because it comes from a plant doesn't mean the production doesn't have a negative impact on animals and ecosystems (eg, intensive monocultures).
And vegans should keep advocating for animal rights and sustainable diets. But they should not pressure others to adhere to their diet. They should be open to respectful discussion about what is best for humans, animals, and the planet.
Omnivores can do a better job of, when possible, selecting animal-source foods that have been produced humanely using regenerative and sustainable production practices. And more power to those who want to reduce intake of animal-source foods for planetary health.
Many omnivores could benefit from increasing intake of whole plant-source foods. And when possible they should choose plant-source foods that are produced in regenerative and sustainable ways.
People who have benefited from ketogenic diets should not be ashamed to have improved their health this way. But they shouldn't push it on others. And they should recognize that there is a limit to how much animal-source food can be produced sustainably, depending on the context.
Those who have found no solutions to their severe auto-immune disease except through a carnivore diet should not be ashamed. But they shouldn't advocate that everyone should be carnivore. All should seek animal-source foods that are produced in regenerative and sustainable ways.
Ultimately, everyone should be choosing foods that support their health and that contribute to a better food system because they encourage better practices. We all have a role to play. So do farmers, businesses, and politicians, but I'll leave that for a separate discussion.
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