What do those quotes emply? That if you are careless enough to not check if the person you are shooting at and you kill him then a punish is in order...
Like tonight on your tig server some guy... wolverine or something, just started shooting at me from a jeep which was a good distance away. If he took the time to see that I was on his team, I wouldn't have punished him...
On the other hand I got killed a few other times... wasn't on purpose and wasn't careless so I forgave them.