Well, that could be because i've never lost a war in Civ 3 while in Democracy, and in the point where i get that gov, i'm usually the most powerful civ, and can spawn endless lines of powerful units and the wars never last that long.
I dont know.. Besides, i never start any wars, unless some weaker guy has some nice resources, or strategically important cities in it's possession. And there's always the pre emptive first-strike wars i might deem necessary if the opponent shows too much hostility.