None of you could even say these things if you didn't live in a democracy.
Of course you could. If your rule/master allowed freedom of speech, dissent, etc.
Nothing wrong with a King as long as he is just. The problem is just the tendency for a King to not be just.
In theory you could have a just authoritarian state. It is is highly unlikely as it would require a utopian (not to be confused with utopia).
http://en.wikipedia.org/wiki/Benevolent_dictatorshipNo, neither in theory nor in reality can this be just. A kingdom is a collectivist organisation, and as soon as somebody wants to rule more than one natural blood community, he needs weapons, soldiers, henchmen and organised violence, and therefore census, tribute and taxes.
Because people who are not related could
never agree to follow someone voluntarily.