I'd consider myself one of these. All living things are equally fair game to be eaten. Obviously some carry social and legal consequences that make it not worthwhile, but ethically, we're all organic matter. Life consumes other life to keep itself going. That's how it works. I don't know why I should be concerned about a cow but not a stalk of celery. They're equally alive.
I guess if you only care about the most primitive, baseline definition of "alive". I would think we had evolved beyond believing killing is killing no matter the circumstance. Do we not wish to distinguish ourselves from primal, purely survival-driven animals?
If you're not survival-driven, you will eventually be out-competed by something that is. If we don't survive, everything else is pointless.
A lot of caring from the vegan community is feeling-based. What this means is that one _feels_ that one cares about living species while not _actually_ caring about them. Furthermore, when one strongly feels in this manner they tend to hold strong beliefs as well. Much like religion, this results in people fighting over their cherished feelings and beliefs.
In the end, nobody seems to _actually_ care about the animals.
Think about it.
Even from a completely amoral perspective where nothing is preferable to anything else, do you not see the social benefits of a community which has the socially-enforced value of "suffering is bad"?
An amoral framework has no basis whatsoever to argue that any value system is wrong. Why would a moral person care about the material reasons why society is altruistic? There's nothing you can argue at the object level that will change someone's moral values.
In general I prefer life should go on living and creating more life in a sustainable fashion, but generally that does involve some amount of suffering for some life somewhere.
If you take scientific materialism to it's extreme 'we are all just particles' ergo, none of intelligence/life/love/wisdom/creation even really exist, it's all just how we perceive randomness.
'Sociopaths' and 'Psychopaths' cannot exist in materialism after all: we're just mounds of atoms.
But once you accept the life principle, which is not so well defined but nevertheless evident to us all at least due to the fact we are conscious ... well then you can start to arrive at why we might think we are 'more important' than rocks.
Then things like 'community' etc. make sense.
But one's metaphysical view needs to have something more transcendent that e=mc2 at the root of it in order for it to work.
The OP's comments are actually reasonable in the context of materialism, and that they are a little 'shocking' to someone normally engaged in life is only evidence of the hollowness of our current rational regimes at explaining the most basic question, which is 'who/what are we'. Knowing how 'dark matter' works will be nice, but it's still secondary to understanding the nature of life itself, I think.
I thought as well that human lives are more important than animal lives, but the question is that when AI gets smarter than us and concious, do you want AI to have the moral value of human life having lesser importance than AI life?
In general, the ethical question of how to assign moral weight to different beings is an open one. Some people would argue that a human being has greater moral worth than an insect. Others argue that all animal lives carry equal weight with human lives (I don't know who these people are, but they worry me).
Moreover, when people (unprompted) claim to be vegans in the presence of non-vegans, they are morally distinguishing themselves. It is the unstated claim "you are in my out-group" that non-vegans find so offensive. But then, a lot of people are offended when anyone they might call a friend goes out of their way to make a moral distinction, and this is not specific to diet preference at all.