Geeze zoo, some of you sound like the first lady and want to outlaw the place.
Everything is OK in moderation. and if you want to eat there you can, If you think the place is horid them you have that right.
I will hit the drive through on occasion the $1 large diet coke is hard to beat on a hot day in a black car in Southern CA. Especally when the water in the cup holder is almost boiling.
Oh they also have salads, I never get one, but they do offer them, I love how you food Nazi's jump to the conclusion that he ordered a Big Mac large fries and a shake with nuggets as an appatizer. And a Nuke heated apple pie. And if he did order that, So what if it is a once in a while thing. I can see a problem if you eat there once a day or once a week.
That fat and salt make things Yummy. No one dreams of having a Rice cake with grilled tofu or hummas as a last meal.
I think even a Vegan would dream of a their favorite burger from their child hood as a last meal.