Appreciate the distinction between representative democracy (a mechanism for choosing/changing the government), and the rule of law (a set of statutes and/or common law laying out how society should function). The covenant was agreed by (mostly) governments chosen through representative democracy, and signed into law (or at least given a nod in various legislation, policy etc).

Ideas like 'the will of the people' overriding established good and just law is the preserve of populists, and in extreme, of fascists. The Brexit referendum being a good case in point.

That’s the difference between voting and democracy. Unions are a form of democracy, as it’s the people who are determining their own rights. But yes, unfortunately rights often have to be hard fought for rather than simply voted into existence.

That’s how representative democracy works. Generally speaking no country has citizens vote on specific foreign policies, with some exceptions.