Hail Seitan!
There Are Seven Fundamental Tenets:
I - One should strive to act with compassion and empathy toward all creatures in accordance with reason.
II - The struggle for justice is an ongoing and necessary pursuit that should prevail over laws and institutions.
III - One’s body is inviolable, subject to one’s own will alone.
IV - The freedoms of others should be respected, including the freedom to offend. To willfully and unjustly encroach upon the freedoms of another is to forgo one’s own.
V - Beliefs should conform to one’s best scientific understanding of the world. One should take care never to distort scientific facts to fit one’s beliefs.
VI - People are fallible. If one makes a mistake, one should do one’s best to rectify it and resolve any
harm that might have been caused.
VII - Every tenet is a guiding principle designed to inspire nobility in action and thought. The spirit of compassion, wisdom, and justice should always prevail over the written or spoken word.
Since in the modern age we can obtain all of the nutrition we need from a well-planned plant-based diet, by buying & consuming animal products, we participate in unnecessary cruelty to sentient beings
I can make an argument that being non-vegan in the modern age is violating all seven of these tenets
Tenet I : It’s neither reasonable, nor compassionate or empathetic, to needlessly exploit & take the life of a creature when we have moral agency & alternatives, unlike other animals.
Tenet II : It’s true that it’s legal to exploit & unalive animals today, but it was also legal to own slaves in the past. Just because we’re legally allowed to do something doesn’t mean we should.
Tenet III : One’s body being inviolable and subject to their own will alone should extend to all sentient beings. If it doesn’t, Name The Trait in a way that doesn’t lead to contradiction or absurdity
That is - Name The Trait different between humans and other animals that makes it okay to do things to other animals that we wouldn’t be okay with being done to humans.
I.e. justify the speciesist discrimination and double standard and differential treatment.
Tenet IV : We should be free to tell people they’re hypocrites for loving dogs & eating cows, or even for participating in the exploitative pet industry instead of adopting/rescuing companion animals.
Even if this is offensive to people. It’s freedom of speech and necessary for the activism and the struggle for justice that should prevail above laws and institutions (Tenet II).
To willfully and unjustly encroach upon the freedoms of other sentient beings, is to forgo your own right to be respected like you would be if you first gave respect to other individuals (animals).
Tenet V : Insisting we need to eat meat or animal products to be healthy despite that disagreeing with scientific consensus, is distorting scientific facts to fit your beliefs,
& not conforming beliefs to your best scientific understanding of the world.
It’s denying reality,
burying your head in the sand to avoid confronting the truth,
& living in ignorance & delusion & the willfull, unnecessary destruction & oppression of others, self, & planet.
Tenet VI : Assuming that we are already perfect & couldn’t possibly be doing anything wrong or unjust, despite every historical society participating in normalized injustice, is not recognizing humans
are fallible.
And, when confronted with your mistake, in the form of what your kind have raised you to traditionally participate in regarding unnecessary systemic exploitation & violence to sentient beings,
if your response is to deflect, close your ears, & refuse to take personal responsibility or change any behavior, is to not do one’s best to rectify it & resolve any harm that might have been caused.
then that is to not right the wrong and fundamentally unjust relationship between humans and other animals and resolve it into one of harmonious and respectful coexistence.
Rather than one of needless exploitation, domination, violence, cruelty, and oppression.
Finally, Tenet VII : To claim that because these tenets do not specifically mention an obligation to not exploit & harm non-human animals unnecessarily & to be vegan, that means it isn’t entailed by
the values underlying them, is to not let every tenet serve as guiding principles designed to inspire nobility in action & thought & not allow the spirit of compassion, wisdom, and justice to prevail
over the written or spoken word.


http://www.candidhominid.com/p/veganism-defined.html?m=1
This essentially aligns with the general understandings/definitions/descriptions of animal rights theory, abolitionism, animal liberationism, etc. Which you can read about on Wikipedia for example.
That said, I am a descriptivist (or rather something like “progressive prescriptivist”/descriptivist, not sure if there’s a precise term for my view), rather than a “traditionalist” prescriptivist. That is, I’m fine with the word vegan being redefined, re-used, re-interpreted in principle, however I also do have certain preferences and beliefs about what definition for the word would be most appropriate or beneficial or serve the most utility, and I lean towards any of the Vegan Society’s definitions from 1951 to present, excluding the definitions before 1951 which had failed to include the full scope of animal exploitation and focused only on food (which is part of why to this day some people still think veganism is a diet). So I don’t really agree with the assessment that I have a “comical understanding” of the word, or that it’s necessarily even possible since to a degree all definitions are valid, at least in theory/in a vacuum & removed from other considerations. Regardless if you disagree with the definition(s) and understanding(s) of veganism that I used/presented, we can at least understand that I’m describing a concept which I am defining the way I have & labeling as veganism, even if we need to use a substitute word to be on the same page, or call it “my definition of veganism” or whatever. I’m saying my definition/understanding of veganism, the one I’m talking about, is entailed by TST tenets. 5. This is sort of too vague an objection to even respond to. I appreciate you said that veganism(/animal rights, as I define it), is a great thing.
I’m not reading that wall of text either.