Why did Murtaugh want to take Arjen alive at the end, when he has DI?
SPOILER
Maybe I missed something in the movie, but Riggs and Murtaugh could not arrest Arjen or his men cause they had diplomatic immunity.
So after being fed up with it, Riggs and Murtaugh decide to go kill every one of them while they have the opportunity, especially since they are all in the same place at the same time.
But then after they kill all of them, accept for Arjen, Murtaugh decides he wants to take Arjen alive. Why?
He will just get off with DI, and Roger's arrest will be considered illegal. So why doesn't Roger just kill Arjen without any warning, just like did for the rest of them?