Even though if you do manage to break out of jail, you cannot possibly know how many (active) cops are inside the PD, so that's another reason why this should be changed.
In addition, it would be nice if the jailbreak would spawn you outside of the PD on random locations (on roof, behind the corner, underground garage, etc.) and not inside of the PD.
This is also helpful if you have an active bounty on your head and the hitmen are waiting for you