Are you misspelling Khan on purpose? That's...really strange.
No, maybe I suffer from a mild case of dyslexia, the auto-spellcheck doesn't help. Plus the fact that there are other Kahn(s) in the franchise spelled differently doesn't help either.
If the knife factory was knowingly selling faulty knives, then yes they would bear some responsibility. David cheated his way to "success". That cheat set the entire set of circumstances in motion. As many others have already said, if David hadn't acted unethically as a scientist, none of the rest of it would have happened.
The people who died didn't do so because the research was faulty, so your analogy is specious. Anything we do sets events in motion that can result in certain people dying and others not dying, it's called the butterfly effect. Khan (I hope I got it right this time) didn't escape because of David. If the blame is to put on someone, it is on the people who failed to notice a planet exploding, and faulty Starfleet habits of sending high-ranking officers on missions that are suited for low-ranking ones. Seriously, what was a Captain doing on this planet?
Second, Starfleet keeps Genesis a secret, making it a crime to even talk about it in public, but they fail to defend the research itself with enough firepower, this too was not a consequence of the research being faulty. We can accuse David of many things (like seeking undeserved praise) but being responsible f
or people dying is not one of them.
The truth is that Starfleet failed to see what was obvious to the simpleminded Klingon, that (faulty or not) the research could be used as a powerful weapon. Their shortsightedness is not David's fault either.
David's behavior, which he knew to be wrong in the first place and did it anyway, directly led to many deaths aboard the Enterprise, Captain Terrell's death, etc. etc.
This is really pretty obvious.
That's not obvious to me.
It's like if I cheated on my exam (highly hypothetical as I am 61), my teacher saw it and made an appointment with my father. On his way to the appointment, my teacher gets murdered by a mugger.
Are you going to blame me for the teacher's death? Why, because I did some wrong that has nothing to do whatsoever with the teacher's death?
So if the teacher is wrong and I didn't cheat and it's my father who got killed. Should I blame the teacher then?
How many people died because you drank coffee for your breakfast instead of tea?