Technically evolution taken as part of the self-consistent self-contained particularly encoded actual block universe is the unique, perfect solution to an optimization function and is in that sense teleological (there is no better solution and there is no solution as good). Notwithstanding the minor caveat that almost everyone who came to know and understand the optimization function would call it total trash and not worth appreciating/following.
Yeah, the issue is that it's not a "solution" because there is no "problem"; it'd just be an observed pattern interpreted post-hoc through terms that imply intentionality where none exists.
The "mindless" part is the bigger issue. Oughts are determined by agents who make things for purposes; objective morality as a baked-in feature of the universe necessitates a creative agent of that universe.
The arguments of zoofags are just exploiting obvious flaws within secular ethics, which are ultimately arbitrary and inconsistent.
I'm not saying that their arguments are good even in the context of secular frameworks, of couse—their arguments are ass, and usually dishonest. What I'm saying is that the reason they're able to drag people down these "harm" and "consent" equivocative rabbitholes is that those are weak and nebulous areas of secular ethics.
They don't want to actually win the argument. This is very important. The point is for the argument to be
just plausible enough for their presence to be tolerated in a space, and
just believable enough that someone dipping their toes in those waters can tell it to themselves as a self-excusing and self-justifying lie.
In their later stages of initiation, amongst one another, they abandon those arguments altogether.
They don't even really want to convince you: they just want to give weak people—who won't risk feeling uncomfortable by thinking too hard about anything, especially if that means confrontation—an excuse not to fight them on it.
This obviously applies far beyond zoofags; you can use your imagination.
Appeals to Leviticus shut these faggots down immediately. If you can philosophically justify that appeal, all the better—even if you don't bother, though, they get the message that they're not getting their grubby hands anywhere near your space.