This is the entire issue with DBD...They want to allow groups to play but refuse to account for the huge advantage voice chat gives them. And they refuse to give killers the option to play against only randoms, because they know killers will never play against groups again.
Entity: "What do you MEAN you guys can't stop the survivors?!"
*Meanwhile, a TF2 Engineer has a Sentry, Dispenser, and Teleporter set up near one of the transformers and is hammering away at the machinery*
Engine: https://www.youtube.com/watch?v=nsQYjvbd0EI