I think it is a little severe to get a 500 credit fine and the guy starts shooting you while all you did is not stop so he could scan you. On top of that (since he is shooting at you) you have to kill everyone in order to leave. If you get killed before finishing off all the 8+ guards and the untold number of civilians in the settlement, you now have a bounty (larger) or even a kill order on you when all you originally did was not stop walking for a scan. Too strong.