Sugar is at least a substance that one can choose not to eat. Lead poisoning and pollution aren’t choices.
Also buying fresh vegtables and cooking instead of buying ready made dishes helps.
Even without human interference, fruit can actually be bad for you if you eat it at the wrong time and in the wrong quantities - fructose has the same effect as sugar - but now we are basically getting into nutrition more generally which is a tricky subject. Fruit still comes with many other nutritional benefits compared to sugary manufactured snacks, and even fibre that make it worth while (note that orange juice, as minimally as we are processing the fruit, still allows you to consume it in unnatural quantity and concentration, which can be very bad).
It does require spending a little time cooking and probably to shop around rather than getting everything from a (possibly overpriced) supermarket depending on how much you can spend. So it's strictly an inconvenience, it requires stretching the argument really thin to view it otherwise.
If everyone did this, less processed sugar would be in our food supply. (corn syrups especially but also weird stuff like stevia, sneaky stuff like maltodextrin, etc..)
The problem is there are far too many pollutants for everyone to be able to educate themselves about every one, and take steps to avoid them. Instead, it's the role of government to decide in each case whether to allow, ban, tax, inform or restrict each type of pollutant.
Virtually my entire extended family are working class people, and they all were feeding their kids apple/orange juice on a regular basis without diluting it. When I showed my sister that she could literally do a 5% solution of apple juice in water, and it still tasted sweet, she was blown away. I'm pretty sure most members of the laptop class know that juice is bad for kids (gatorade too), but that message hasn't filtered to most of the population. And these kids are too young to know how toxic it is for them.
Can you cite specific examples of the public health establishment pushing juice as healthy? I got a minor in nutrition over a decade ago and back then, public health officials were very quick to call out the juice industry for its predatory tactics on kids and false equivalencies. This doesn't match my experience in university at all.