I have the feeling that this is controversial because it plays with guilt feelings and people, in general, don't want to be the bad guys and rationalize bad decisions polarizing the opposite field. This is reflected in the vegan cliché.
It might go deeper. Many societies are not that far away from hunger and poverty in the past.
I can see memories of hunger and war in our collective behaviour and also shaping my family, and wealth including being able to afford to eat whatever whenever cushions that a bit. In Europe, the grandparent generation that grew up with the war and the following hunger years is still alive.
