memes

I didn’t think the had an official organized statement

There sort of is. The term "vegan" was coined by some members of the Vegetarian Society of the UK in the 1940s (at the time veganism and vegan diet were mostly referred to by terms such as "strict vegetarianism" or "no animal food" etc.), who shortly after founded the Vegan Society [of the UK]. The latter has an "official" definition of veganism:

"Veganism is a philosophy and way of living which seeks to exclude—as far as is possible and practicable—all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose; and by extension, promotes the development and use of animal-free alternatives for the benefit of animals, humans and the environment. In dietary terms it denotes the practice of dispensing with all products derived wholly or partly from animals."

Of course individual vegans may have slightly different definitions, and may interpret them differently, but as a whole this seems to be a fairly accurate definition for many vegans (although there are some exceptions, e.g. people who adopt plant-based diets for (percieved or actual) health benefits, or religious reasons, sometimes (but not always) also refer to themselves as "vegans").

As to the "literally right" part (I assume the OP was referring to veganism in general, not the specific issue of the thread), it mostly boils down to whether or not we think the statement "it is (morally) wrong to unnecessarily cause harm to animals" is correct. Since most people (with perhaps the exception of some with rare medical conditions) can survive just fine on a diet free of animal products (same goes for clothing etc.), we can conclude that it is at least unnecessary to use animal products. Thus, if we agree with the rest of the statement (i.e. that exploiting animals for their meat or other products causes them harm) we should also agree with veganism as an ethical stance. Naturally this could be discussed in much more detail and with many caveats, but for me this is more or less the core of the argument. And as it turns out, a lot of moral philosophers from different meta-ethical schools (such as utilitarianism, Kantian ethics or virtue ethics) seem to agree at the very least that the arguments in favour of veganism are much stronger than those in defense of eating meat (and particularly those in defense of factory farming). Some further reading for those interested:

• https://en.wikipedia.org/wiki/Ethics_of_eating_meat
• https://en.wikipedia.org/wiki/Veganism#Philosophy
• https://plato.stanford.edu/entries/vegetarianism/