A Prime Minister has a difficult judgement to make when deciding whether to sack one of their ministers or not. Faced, for example, with a minister involved in some kind of scandal, the Prime Minister might feel they should sack them to show they stand up for integrity and high moral standards, or, on the other hand, allow them to remain in post for other reasons such as loyalty to a colleague or a belief that they are, on balance, doing a good job. Sacking ministers shows that the Prime Minister is prepared to live by principles, even if by so doing they lose valued colleagues. The electorate will judge the Prime Minister to have acted with integrity: that is an invaluable perception for anyone wishing to remain in power.