I use the same laptop bag for several trips a year, so I often don’t clear out all the pockets. The other day I realized I’ve been flying back and forth with a lighter I got from Vegas 2 years ago because it was buried at the bottom of a pocket. As for why the hell I had it in my laptop bag in the first place, I have no idea.
Not the person you’re responding to, but I think that the argument “we shouldn’t do X because no other animals do it” is a bad argument in general and overall weakens your position. Because there are plenty of things that humans do that animals don’t do that are good (like developing and applying vaccines for example).
There are plenty of other valid and good reasons to promote dairy alternatives (such as health or environmental reasons).