There truly are a couple times within the classical trilogy (Silent Assassin, Contracts, and Blood Money) where it does seem slightly canon for non-targets to be killed. When it comes to an example, I just can’t remember. Only joking, in fact I actually do remember a few, but my mind may be missing the bigger picture (AKA, the list of each and every freakin’ one of 'em).
I know that in SA and Contracts, you are allowed to kill a guard or two sometimes and keep SA. Then, in BM, the accident kills will not be considered kills on our ranking, even for civilians.
So, assuming that it is canon that every mission is at the very least passed with Silent Assassin, some of the ones that come to mind for me would be:
SA: The driver and nearby guards around the car that blows up in the Kirov Park Meeting. In my opinion, the most all-encompassing way to complete this mission Silent Assassin, can also easily be done suit only. The mission sets you up to either bomb-em-up or snipe 'em. But I always look for the “fullest” approach to consider my head-canon. So what I do is go get the bomb and rifle by the dumpster, run to the nearby manhole when nobody is looking, pop on your night-vision when in the sewer, since they are provided, this is hinting towards it being a form of canon, make your way to the general’s car parked over the male-hole and place the bomb. Then after that, make your way to the manhole closest to the radio tower. Climb out, go around the alley, wait for the guard to be closer to the street, then run to pick the tower lock, immediate run into the fenced area and crouch behind the dumpster. Then, way for the guard to make his way to the other side, then wait for him to be on his way back to the street side. From there, you have plenty of time to sneak and anesthetize him. Then simply climb the tower, and snipe the mob boss, but not the general. The general will then be blown to bits, along with his driver and a couple guards nearby. They won’t count as kills in your stats, to my knowledge at least, and you still will get silent assassin. For a bit of extra canonization, I will drop the rifle by the knocked-out guard at the bottom of the tower, pick up his AK, and drop it by the dumpster. That way, he will be blamed for the assassination, and will wake up confused and not remembering what happened, and may even come to believe that he himself DID do it, in a sort of delusional state.
Are there any other ones you can think of from Hitman 2: SA? I just can’t remember, but I’m hoping for more.
Contracts: I haven’t played this one as much, although I just do love it. I think there must be a few in this one since the original codename 47 required it in certain missions.
Also, perhaps the psychopathic brother of the Meat King?
Blood Money: Here there could be quite a few, especially with accident system. I definitely think the truest method for the effin’ opera house mission, is to replace the actor’s gun, then drop the jumbo rafter, or (I think) the chandelier? I just don’t remember which one is better stats and method-wisings, but I wish more than anything that I did. Regardless. I know the light fixture kills many civilian actors, perhaps some cops or guards, and of course the target. I believe the chandelier also usually kills at least one guard, but it don’t show up in the stats.
Then IIRC, the Vegas mission with “This is a large casino” also I think has a section where it seems intended to push a civilian off the balcony, can’t remember however. Throughout blood money, there are many times where it seems we are supposed to involve non-targets in accidents, from pushes, to others. Please let me know what you think.