I swear the amount of people who wanted to gang up on Jason was crazy.
This is easy to answer. The Killers can´t be killed... Just take a close look at the Killers and you´ll see that they´re dead already. With some it´s more obvious (Spirit, Wraith, Hag...) than with others (Trapper, Legion, Ghostface)... but the conclusion is, all Killers are dead people.
Yeah and Survivors can't be killed either. They just respawn at the campfire. So? It'd be fun to actually have a new DBD mode where Survivors collaborate to actually imprison/kill the Killer. I think a lot of people would appreciate the more direct and personal victories over the killer rather than repairing gens.
but tbh, we all know the real reason: that's a lot of work to design and build. it won't happen, if the game isn't struggling they have no reason to shake things up.
If they did somehow manage to pull that off, I imagine the killers would just come back to life in the same fashion that the survivors do. The Entity probably wouldn't be very fond of that, though, granted it made the Trials play out how they do for a reason. I think it'd intervene before or after it happened and prevent it from happening again.
So, Iam gonna quote for this game's slogan: death is not escape. Even if survivors were able to kill killer, it's not gonna change anything. It would be as significant as survivor's death.
And also, there is a great quote from Batman:
If you kill a killer the number of killers in the world remains the same.
So, this most likely will lead to corruption of this survivor and becoming Entity's another tool.
When survivor learns Franklins Demise
The entity should kill him/her if he/she gets zero kills.
In a normal leveled playing field, some survivors could fight back and even kill killers. Let's take Jeff and David for example:
Those two could take on most killers, like Legion and Pig or even Ghostface.
But the survivors can't fight back in the Entity's realm. Here's probably the best example:
David King, an alcoholic English pugilist can't even defend himself from a schoolgirl like Julie or Susie, yet they can easily pick him up like a 12 pack of beers. Why? The Entity controls everything in her realm, everything. But hey, maybe that's just limited to gameplay mechanics. I'd like to think that in the actual trials David would put up good fights against the killers. But that's up to the Entity to decide.