If nobody died, you didn't lose your best friend Jim. And if only one or five people died, it was probably the new kid that just signed up in town.
And who takes time BURYING bodies? Sheesh. Just stack them up like cord wood and set fire to whole town to make certain everything burns down to a nice, sanitary, ash.
Now here IS an interesting idea. Those units with lower cohesion wouldn't care so much about casualties because they don't like/know the others as well. While units with high cohesion would really feel bad about losing people.
"I've been drug from my home and family to fight in a war I don't understand and those dead people could easily have been me under different circumstances. This armor is heavy, it chafes, this camp is rife with disease, the food sucks, and we're constantly on edge hoping a larger army doesn't come and murder us." - every BM soldier ever.