I think in a scenario where a cop will retaliate, and is expected to retaliate 9 times out of 10, and when he does so he is allowed to be killed, it would be unfair to strip him of deadly force until the situation escalates with the attacker striking first. Also considering it's darkrp, I don't see a reason for cops to be the goodieboys, making it corruption could probably fix all this.
(Also the second choice still allows you to arrest)