A lot of player scavs have the habit of killing other player scavs when they're looting in the same area. This bothers me particularly because it always seems to happen to me when I'm looking for quest items (in this case I need soap and sodium for a weekly).
The thing that bothers me the most is that there's nothing you can do about it. You can't preemptively shoot a shifty scav or you incur a penalty for yourself. As for them, they clearly don't care forscav karma and there doesn't seem to be any consequence to losing it. I know that they can become tagged by AI scavs but honestly I think player scavs should have some way to identify tagged player scavs. I know tarkov is supposed to be hardcore and all but there's nothing hardcore about this. You literally have no way of knowing what they'll do whilst they're shooting fish in a barrel.