Well said. I think the truth is that not all humans can thrive on X diet. Both the omnivores and vegans need to realize this. Do what nurtures you and let everyone else eat in peace.
Then you might look into Fertrell fish meal, or feed made with it. As a meat eater myself, I totally hear you on the way most meat is raised. Horrible. But Fertrell fish meal is caught sustainably, cooked, then dried and only preserved with an extract of rosemary oil. It's really the best...
That does bring up a good question...if you do get chickens, what are you going to do with all those eggs? Just curious. And welcome to the site, lots of helpful people here.
x2 what @cluckcluckluke said.
Some chicken feeds are mostly vegetarian, but they will get better nutrition if they have some animal protein in their diet. It's very difficult to get all the essential amino acids in the right balance from a vegetarian diet.
Unless you lock your chickens up...