It's a question of history, of stability, a matter of decency, honour and loyalty, about something bigger than oneself.
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But it doesn't matter who they are, sw. It's what they are that counts. God forbid, but you could discover that you are by rights next in line to the throne and the fact that, meaning no offence, you're a ghastly bog-trotter with no more idea of how to behave than a retarded Jack Russell would make no difference to the fact that I would respect you as King. That's how it works.