It's not about being handwavey. I am vegan and in my experience, most vegans for ethical reasons have no reason to be concerned about cross-contamination becaus

It's not about being handwavey. I am vegan and in my experience, most vegans for ethical reasons have no reason to be concerned about cross-contamination because they're not purchasing an animal product. I care about not supporting the use of animals, and purchasing an animal product is the actual factor that contributes to this. Frequenting an establishment that profits off of animal products is, of course, a valid issue but that's different than meat juice contamination.