Vegans that think like this aren't right, you can not eat meat if you want, but eating meat is a natural thing. We humans, especially in America, eat entirely too much meat, but we are omnivores. You don't need meat to survive but it's easier to do so when you eat meat, and as it stands, cheaper! The real issue is the cruelty and unsanitary conditions that are rampant across the factory farm/meat industry. There is too little regulation, and too few companies controlling the market. An equally good form of protest is to just get your meat sourced locally. It can be an even better form of protest depending on what you would eat as a vegan, because there are several crops that are commonly eaten by vegans that have slave labor and water depletion involved i.e. almonds and quinoa.

Edit: wording

Straw man. Vegans don't claim veganism is natural. That would be a logical fallacy, anyway. Vegans claim that what you do to animals is cruel, violent, and needless.

Biologically, you are an herbivore; the more meat you eat, the younger you die, and the more major diseases you experience. Biological meat eaters don't get heart disease and diabetes from eating meat, for example. But let's say that you are a (non-obligate) omnivore. That means you can choose not to be cruel and violent. If you don't have to harm vulnerable individuals to be happy and healthy, then why do it?

Biological meat eaters don't get heart disease and diabetes from eating meat, for example.

Humans do not get diabetes (type 2 the most common) from eating meat, it's a direct result of pernicious carbohydrate consumption

The same for heart disease