Of course you need tech. If you don't know how to properly burn down the city, then the citizens (of which your army is made up) will revolt.
They require safe handling of all destructive materials before they will let you burn their homes and workplaces to the ground.
LOL, what? When you raze a city you are burning and destroying everything. You are taking all the men (the cowards who won't fight), women, and children out of their homes and slaughtering them. You are burning everything to the ground. I.E., genocide, because when you raze a city nothing is left over (or at the very least, the people are fleeing to the wilds as their city is destroyed). I beleive in MOM, if you razed a city, you lost fame. Genocide tends to make you infamous.
Citizens of a foreign town do not make up your army. When you raze a city, the citizens are presumed to be killed or to have fled into the wilds. Either way, they have basically vanished in game terms. Your post above actually makes the point that the NORMAL CONQUERING and holding onto a city needs tech, since the buildings are left in tact and the people left over are allowed to live presumumbly as slaves to serve you. If anything, you would need tech to be able to conquer and hold onto a city with some population left over.
