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Roblox argues 8-year-old waived rights in wrongful death lawsuit
(www.courier-journal.com)
This is a most excellent place for technology news and articles.
Minors (except immigrants who have not been naturalized) are citzens, and they do have rights. For example, minors can be issued passports, and cannot lawfully be deported. That's because they're citizens.
Also, you can't just walk down the street and kill a minor. That's an example of a right that everyone has, regardless of whether they're citizens. Generally, the Constitution refers to such people as persons rather than citizens.
The vast majority of minors are not wards of the state, the only exception being those who are declared wards of the state through explicit legal procedures.
So nothing you said was correct.
The real rationale for Roblox being full of shit is that minors cannot execute contracts. And there are what are called unconscionable contracts, which are invalid even if the signatory is not a minor.