Earlier quoted context omitted.
Not sure how this is at all relevant? In both cases children under 18 aren't allowed to vote. Or do you mean they should be allowed to have a say in this?
The vast vast majority of citizens in either country do not play a part in legislation. The USA has lobbying, which is seen by the rest of the OECD countries as a legalized form of bribery. This allows regulated industries to corrupt and otherwise influence the regulation of their own industry. The USA might very well have similar restrictions to China on say prize boxes in video games if not for the outsized effect…
There's no perversion of government caused by lobbyists. On net balance lobbyists are beneficial - and sometimes they're all that stops a 20-something Legislative Aide from drafting a terrible piece of legislation which the Member only faintly understands.