That’s like asking why a fair and just executive shouldn’t be interested in eliminating the overhead of an independent judiciary. Synchronically, it should. Diachronically, that’s one of the things that ensures that it remains fair and just. Similarly for transparency and leakers, though we usually call those leakers “sources speaking on condition of anonymity” or some such. (It does mean that the continued transparency of a modern democratic government depends on people’s continual perpetration of—for the most part—mildly illegal acts. Make of that what you will.)