Because it’s an important perk of history ty
When agriculture began, the early people farmed, and soon got a surplus of food. This surplus of food meant that not everyone had to farm, and that led to specialized jobs. Specialized jobs led to trade which led to economy, a major key point in a civilization.
Because thy feel the need to share their beliefs and how strongly they believe them. That’s why churchgoers are known for being so judgmental. For example if they say if you’re gay you’re going to hell.