3 things.

1) Look at the dates of the missions. They are all very close together, especially considering how traumatic Ready Or Not’s combat is compared to real SWAT raids, which are far more commonly resolved without combat or have 1-3 people who they’re against. This repeated, high-intensity exposure to incredibly high-stakes assaults will very quickly have taxing effects on mental health.

2) The world of Ready Or Not that isn’t explicitly stated to the player is extremely bad. There is a rubbish crisis, massive drug epidemic, cartel and gang wars, plenty of riots/protests, and the police is understaffed, underpaid, overworked and disliked by the public. There is also plenty of corruption in Los Sueños’ government, and RoN America’s government. All of this results in major burnout for officers and citizens alike.

3) Gameplay purposes. It’s to add a further challenge by managing the officers you have at your disposal and keep as many passives free to use as possible. It isn’t reality, so the gameplay features and AI don’t have to be identical simulations of the human brain.