Earlier quoted context omitted.
Why should a prison accommodate a prisoner who is a vegan any more than one who wants to eat filet mignon for every meal?
Vegan doesn't mean higher quality. It can mean a large serving of beans and broccoli.
I suppose you could intentionally sabotage someone by putting bacon in with the beans, so just avoid mixing expensive bacon in with the cheap beans and I think everyone will be happy?
My guess is dietary sabotage is intentional, even if it takes more money and more effort, as a kind of psychological torture. "The guards will beat you if you don't put bacon bits on your salad because they know you're a vegan" type of thing.
(edited to explain, I ate years of institutional food in school lunches, then the Army, and then at University, pretty much my first quarter century of life, and I assumed its "about the same" in prison. Which is very interestingly, apparently, completely wrong. Prison is apparently more like every inmate gets "the" TV dinner today and there's no sharing/trading allowed.)