Yes, but I thought you were upset about the bandits? So why are you killing the peasants? Oh, because the bandits swim among the peasants like fish in water, classic Mao?
So now you murder the peasants and drain the ocean and no more bandits.
Except now your land is empty.
Oh, you move new people in? From where? Yeah, younger sons of the nobility. Except they don’t want empty land, they want land stocked with peasants to do the work. No peasants, the land is useless.
Yes, eventually the land gets resettled. Eventually. You can’t just get depopulated land back up and productive in a year. You burned and pillaged and murdered, remember?
If you move peasants from your lands to the new lands, then suddenly your old lands don’t have enough people to work them. And then you’re planning on giving those lands and the peasants on them to your vassals? You can’t kill thousands of peasants today and replace them tomorrow, it takes a generation.
Your problem is that you are thinking like a modern industrial age autocrat, not a medieval monarch. Yeah, when you’ve all Connecticut Yankee’d your new industrial revolution from scratch then go ahead and act all modern. But the social organization of the medieval period followed from the technological and economic base of the medieval period.
In the medieval period every mouthful of food was laboriously wrung from the earth by hard labor. Every piece of metal represents hours of work digging ore with hand tools, collecting fuel, smelting and smithing. Every scrap of cloth was laboriously wrung from the land the same way–tend the grazing sheep, sheer the sheep by hand, wash the wool by hand, card the wool by hand, spin the wool by hand, weave the wool by hand, sew the cloth by hand.
Kill the peasants and who’s going to do this work–the knights? Hell no. Killing the peasants is like an industrialist who gets mad that his proletarian workers are demanding better wages and so he burns down his own factory. The peasants are the factory that produces everything.
So better get that anachronistic early industrial revolution going before you start destroying the means of production that supplies the economic base of your aristocracy.