Terminating employment within PS is a complete nightmare, courtesy of the T&Cs that PS has bestowed upon itself, that's why you don't see it very often. Procedure has to be followed to the letter and dot, compensation awarded and any PS union representation dealt with as well. Few PS managers have the inclination, experience or skills to do this and it's simply not part of the PS ethos to do it.
You have to have done something seriously, seriously wrong to justify being fired or it'll just be quietly accommodated and smoothed over and forgotten about as always. Govt can afford to do it.