There is not a conflict between the two. It's a matter of ensuring there are parallel tracks that need to be paid attention to from the onset of the hostage-taking.
Right from day one we go to great lengths to ensure that the family is well aware that the primary focus in attention is the safe release of their loved ones, and then, at the same time, that if we do have an opportunity to lay charges and prosecute some of these individuals down the road, they would be potential witnesses.
There is an explanation with respect to the dual tracks, but they don't conflict with each other.