The only instance I ever respond to the same situation that's on-going is when I was one of the first ones to die while the rest of the cops play smart and wait for opportunities, giving me time to respawn and lose my NLR.Cops already have a 10 minute timer, if your still idling around a raid 10 minutes after you wipe out most of the PD, then its your own fault.
I will say, I am a massive cop main, and it is VERY RARE for me to respond to a situation I already died at after my NLR was done
The only thing that it takes is a few cops being patient with their pistols and holding for reinforcements, which could be enough to get another wave going that the civs can't do much against unless they rush push out to take them out, which in of itself is extremely risky. I myself am guilty of doing this, waiting for reinforcements rather than go in alone or with only one other cop, but at the same time this is not something you can fault me for seeing as the PD is meant to be a trained force, so I prefer to act like it.
Personally, I believe cops should only be able to return to the same situation twice, something which should give civs a well deserved break to clean up and GTFO. Cops are absolutely supposed to be the dominating force, but being infinite in waves makes it really hard for civs to control their situation when there are so many things toshoot and loot in a raid on top of needing to ensure their own safety. I strongly believe cops should have a serious negative side to bumrushing civs every raid without ANY pre-planning, being disallowed to return a third time.