Fully vegan?
It's an argument that only arises when people want the total avoidability of killing a cow and the total unavoidability of killing micro-organisms when we breathe to moraly equate.
I just like to posit that because Hitler had to breathe he had to gas millions of Jews.
Not wise to shove the sword of stupidity that far up it's wielders butt if you're not very quick at ducking punches, mind.