When faced with the decision, arrest or kill, the obvious tactical decision is to kill. An arrest allows the opponent to continue speaking, takes longer, and may render the arresting party out of position. Arresting provides little tactical advantage to the arresting party.
If however, interacting with an arrested enemy allowed an individual to listen in on the communication of the opposing team, an arrest could provide valuable intel.
For example, say a guard arrests an intruder. He may now listen in on the intruder comms. However, he may leave himself or his teammates exposed as he listens, for he