No food individually "causes" obesity and health issues. Overuse of some foods can. If we want people to be healthier, maybe we should offer free accessible cooking classes, or (gasp) not put people in the position where they have to work so much to pay the bills they don't have time to prepare healthy food.
All this does is punish people who are already in shit circumstances. Maybe they want a treat for their kid, maybe they want to have a fun movie night, maybe it's none of your business?
There really is no rock bottom for how fucked this situation is, is there?