The way the UK system works (and I imagine the same is true in the US and other FPTP, 2 Party systems) means officials who behave badly are retained and promote

The way the UK system works (and I imagine the same is true in the US and other FPTP, 2 Party systems) means officials who behave badly are retained and promoted while the clean, honourable ones are rapidly expelled. Parties want officials that will do as they are told. The way that is assured is to know and cover up for their sins. 3rd time drunk driving? Can't keep your hands to yourself? Money keeps being sent to your personal account? Don't worry, the Whip will sort it out, no one needs to know, and don't forget to vote as you're told tomorrow! Squeaky clean, honest, principles representative of your constituents who won't vote against what is write for them and the nation when told to? You'll be removed quickly.