Fortified junk food is still junk food. It isn't only what a food doesn't contain (i.e., those nutrients) that makes it dubious. It's what it does contain. The addition of vitamins and minerals does nothing to exonerate junk foods of their standard provisions of added sugars, added salt, artificial flavorings, artificial colorings, inflammatory fats, high glycemic starches, and willfully irresistible calories.
There is a point at which invoking personal responsibility to deal with a contrived array of obstacles is both benighted and callous. Yes, everyone should try to eat well -- but they should not have to overcome the ingenious manipulations of highly paid mercenaries conspiring against them to make it so.