You obviously haven't crossed him in OT.
Indeed. On OT, you find people who actually believe that communism could be democratic, despite theory, common sense and the evidence of history.
BTW, I disagree rather strongly with the proposition that it is possible to separate the system of government from economics. Democracy is always associated with a mild combination of fascism and socialism, together with a fair amount of nanny statism. It reflects the natural human tendency to mind each others' business while still keeping up pretensions of necessity and civility.
Communism, in contrast, requires the putting the boot to the people. Hard. It invariably does exactly that.
But back to Civ. After all, this is not OT.
I am fascinated about the fact that the Civ series seems to reward nonsense economics with huge benefits. That is true in Civ3, 4, and 5. Not so much 1 & 2, where Democracy was King. According to the first two entries in the series, there is zero corruption under democracy and growth is rapid. Both wrong.
OTOH, maybe I read too much into this. Perhaps it's just about game-play. In this regard, Civ3 has been a complete failure. It utterly failed to balance the governments. Surely the objective should have been to provide interesting choices and to tempt players to switch from time to time. Instead Republic is best about 90% of the time and there is almost no reason to ever switch out of it. Monarchy, Feudalism and Communism (in roughly that order) are occasionally useful and the rest are worthless.
In Civ2, there was a natural progression. You went from Despotism to Monarchy to Republic to Democracy (maybe skipping a step depending on the map). In Civ3, you slingshot Republic and stick with it. Boring.