Beside voting and children, most of the time people need a permit/license to show that they are fit to do the things you mention.

I don't know what a way to show that you are a rational, well informed, mentally fit citizen able to responsibly vote without falling for basic fakes news and misinformation attacks would be.

At least denial of reality should raise serious questions. How can we expect a flat earther, 6000year-old-world believer, climate change and holocaust denier to rationally chose who to put at the helm of a country?

Politics should be about people disagreeing on the means to address a set of common challenges, not about those who imagine living in another world so far removed from ours that they can't have a valuable opinion.

Facebook is under no obligation to assist in planning and organizing an attempted mass killing event. Neither are you or I, which is how it should stay.