It's still not cheaper to have a very meat rich diet then to have one that is mostly plant based; or entirely vegetablebased plus milk and eggs from local production - which wouldn't get you in some of the difficulties vegsns have to desl with, where they need to take some nutrients in the form of supplements if they don't absolutely optimize their diet (which again becomes expensive - would be interesting to be corrected here)
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.