Shooting and over penetration

I needed to rant....Except for one episode of the walking dead, over penetration of bullets never happens. The early episode where a character from Hershels Farm shoots a deer and the bullet goes through and hits Carl. Otherwise I can't think of another time where a bullet doesn't pass through a target and into anything behind it.

In season 11 episode 12 there's a scene where a group fires at a line of zombies, but behind the zombies are a few main characters. It's so unrealistic. Even hollow point bullets have some over penetration. And I would expect more with how frail some zombies are.