Few people can afford to give a shit. Most people are getting the cheapest meat and dairy they can get from Walmart.
All that is to say: some people act less ethical then others, and should have to accept that fact - instead of trying to produce an image of the self (to themselves mostly but also to others) that conceals it; be it through normalization ("guess we all do that"), rationslization ("if i wouldn't do it someone else would"), or blame shifting (if someone would do this and that i would behave like that, so it's up to them to provide me with xyz)
edit: I apply that to myself. I know that I don't act as ethical as I could regarding the consequences of my diet.