That's very true. Even with a crap diet, breastMILK is STILL more nutrionally sound than Formula is..... it still has all the immunological benefits, among many others, in it that formula will never have.
Just to clarify, if for whatever reason you couldn't breastfeed anymore, you would happily accept the breastmilk of a mother who drank, say, a bottle of jim beam a day as a replacement?