"normal person hacks into the phones of dead people or approves this?"
I fear that almost anyone in journalism might have been tempted, if they felt it would improve their career as they might get a scoop. It is partly down to the buying public, too, about what is "accepted" as worthwhile content.
One of the weekly (womens') mags gets promoted on TV as having 99 bits of gossip for 99p (sorry, I try to blank ads but the voiceover guy always sounds like he's in a hurry!) so (parts of) the media encourage the public's hunger, and then feeds it.
Not sure quite how the politicians are involved at this point - not convinced they are paying for views to be put into the papers, and seems like they are more likely to be acting in ways not to 'offend' certain media interests, lest they get hung out to dry in the press.
I bet a lot of politicians have skeletons in cupboards they don't want aired in public, and you can expect the muck raking journalists with private detectives and paid informants have collected a bunch of nasty tales about different people, their past lovers, mistresses, debts, and so on.
As for the police - it is a bit worrying that the Met represents about 25% of the UK's police numbers and resources, and being centred on the capital, are side by side with the major papers.
London and the South-East are all too often given priority so it is time to move Parliament elsewhere, eg to Birmingham, and let's see other transport projects and other parts of the UK get developments, not just those centred around the bribery and corruption centre, London !
:)