A democratic earth would stand a decent chance of marginalizing your social-political-religious group. There's a while lot of demographics on Earth.
Think about a random sampling of all humans. Most are in Asia, esp India and China, and most are traditionally religious.
Would women's rights be a priority? Fair employment? Gay rights?
I do think that an integrated and conscientious Earth is important, especially with reasonable immigration and emigration rights, but I'm not sure I want to vote in a Earth President election.
Gays are a minority in every democracy, and this does not make them marginalized in all those countries.
To the contrary: democracy makes it more likely that they are tolerated and included.
So your argument is not at all compelling.
Also, to help you see it: take European Union as an example.
It is only a loosely integrated democracy, but still, we elect EU MPs etc.
EU does not prevent at all to have traditions and to "respect" the existence of geographically distinct "samples" of humans (its member countries, or its member intrastate regions, etc).
Any minority group that is not acknowledged by the majority as being worthy of basic rights will struggle and probably be marginalized.
Western nations do well with certain minority groups (they have many allies). Other cultures do not. The question is whether the majority of people would fall into a western like mindset or not. I think not.
> To the contrary: democracy makes it more likely that they are tolerated and included.
There is a correlation here, but it isn’t causal. Democracy has been around in countries that support gay rights for much longer than they supported gay rights.
What’s made the difference has been cultural shifts wherein the majority supports gay rights rather than opposing them.
Think about a random sampling of all humans. Most are in Asia, esp India and China, and most are traditionally religious.
Would women's rights be a priority? Fair employment? Gay rights?
I do think that an integrated and conscientious Earth is important, especially with reasonable immigration and emigration rights, but I'm not sure I want to vote in a Earth President election.