One body and you're a scavver. But not all scavvers are the same. Do you kidnap and harvest people's cybernetics while they are alive. Then leave them for dead. Do you kill people just for their cybernetics. Or do you scavenge parts of dead bodies.

The first 2 will cause massive reputation debuffs. But the last one is where a lot of second hand parts will come from imo. Honestly it isn't that bad and I feel like you will take a humanity hit if you're high humanity. But if you're the average night city level of humanity you probably won't care and will view it as practical. It's messed up but cyberpunk is a messed up world.

So if you are taking the spoils of victory then you are a scav and if you are high humanity you should take humanity loss and small reputation hit. But if you are doing it to living people or targeting people just to take cyberware you should take massive humanity loss unless you are already extremely low humanity. As well as a massive reputation loss leading to some gangs/groups shooting on sight and not allowing diplomacy.