Actually, it was much rarer. It was one of a kind.
Not that I think it matters worth a damn how MANY of something there are, because they're all still individuals. It's not like we have any shortage of people, but I have a feeling you'd be none too happy if somebody bumped off your best friend.
and my last thing to say on the subject:
The only response I'll ever have to this classic is that by this logic, you'd be totally fine with it if aliens with higher brain functions decided to incinerate humanity.
It's the responsibility of the more powerful thing to protect and aid the less powerful thing(must.... not.... look.... ridiculous.... by.... directly..... quoting.... Spider-Man). That's just the way I see it.