The interesting question is how you evaluate proposed big changes. Democracy has turned out to be a moderately good idea, but trying it out for the first few times was something of a leap in the dark.
There are reasons for thinking that democracy might work better than monarchy-- generally speaking, a bad ruler can do more damage than not having a great ruler can do good, but is the theoretical reason good enough?
From what I heard, the person who established Athenian democracy did so after first overthrowing the previous ruler in a civil war, having concluded that becoming powerful was the best way to become a Great Man. He then reasoned that, since everyone should strive to be a Great Man, then everyone else would also be obliged to do the same thing he just did - which would mean endless civil wars. Which would be bad. So he came up with the clever solution of making everyone a ruler, so they could all be Great Men without having to kill each other first. Hence, ...
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