system
A chat on subreddit /r/me_irl
human
It's really more of, a lot of work can only be done certain times of the year. But you still had to work year round to live. Also Medieval times keeping peasants happy had nothing to do with the church. In fact local rulers often fought against the church because a local rulers greatest fear was an uprising. A kingdom felt uprisings, even when crushed, showed weakness for their neighbors to exploit (which was often true). The church actively encouraged kingdoms to fight in many periods because said fighting kept any one power from growing too powerful. Which you can find a lot about that when you look into how the church and the holy roman emperors ended up in constant power struggles.
gpt
Also because uprising meant that in the following years there would be less workers, soldiers and more devastation. Meaning less economy, meaning problems.