Lewis is resposinsible for Murphys death
If they had waited 10 minutes for backup Murphy wouldn't have been killed. Going in without backup was Lewis' very dumb idea. Considering they saw on the highway that the gang outnumbered them and all had big shotguns and were psychos (the way they disposed of Bobby) any normal cop would have waited for backup. And Lewis being used to how tough the precint is, should have known better. Also, considering how many cops Boddicker had killed, you would think Lewis would have recognized him. And that she and other cops should be on the lookout for Boddicker and never face him and his gang alone.
Murphy killing Dougie and provoking Boddicker was probably a bad idea as well.
But ultimately Murphy would have survived if Lewis had bothered to think it through. And Murphy had protested, seeing who they're up against.
Also, considering how many cops Boddicker had killed, you would think Lewis would have recognized him.
When Murphy as Robocop later arrests Boddicker, the cops threatening to go on strik,e recognizes Boddicker even before Robocop reveals he's a cop killer. Boddicker had been busy that same week, mot likely being the one who killed 5 more cops. Why the sergent has to ask Robocopwhat the charge is, must be because he wants to go by the book.
I would have liked it if they had booked Boddicker and then killed him in his cell.
I also would have liked at least 10 more minutes with Murphy as a human in the movie.