Taxes aren't punishment, they deincentivize the purchasing of products that result in negative externalities. Like junk food. You can still buy them if you want to, you're just going to be faced with gross pictures and a slightly higher price. If you still want the food you can buy it, if you're buying it in mass quantities everyday, now it's harder to sustain that habit. Some government regulatory body would have to set hard limits on what is and isn't acceptable to be taxed/labelled. Food companies will scramble to prevent their products from falling into that category, which may mean less-shitty food being produced and sold. So that's a win. And IMO the warning labels serve as a form of education.