With the unwarranted surveillance of the innocent by the menagerie of surreal imbecility formally known as the Metropolitan Police, the usual reflex of liberal folk is to sympathise with the surveyed. In the case of Jenny Jones, the Green peeress and former candidate for the mayoralty of London, all my pity is reserved for her surveyors.
The tale of Baroness Jones's rise to prominence as a lethal enemy of the State underlines the Met's auto-satirical genius. Only now, after obtaining the relevant files with a request under data-protection legislation, has this Greater London Authority member come to understand the threat to public order she has posed.
Previously, she must have naively imagined herself to be a model of good citizenship. Having forsaken archaeology to enter politics in middle age to campaign for such herbivorous causes as safer cycling, she even managed to dupe Her Majesty. In 2004 she was included in a Buckingham Palace list of 200 women of achievement.
Yet she now discovers that, during 11 years in which she sat on a GLA committee scrutinising the Met, in a thoughtful reciprocal gesture the Met was scrutinising her.
It recorded her political activities on the secret database it reserves for the 9,000 "domestic extremists" who regularly attend legal protests, but whom it feels in its bones may in the future commit some trivial public order offence in pursuance of their political ends.
How many officers serve in the domestic extremism unit – a body the comedian Mark Thomas, a database star himself, identified as welding the mindset of the Stasi to the precepts of Ealing comedy – is unknowable.
One day, when any residual dregs of public trust in the Met have evaporated, a Government will hire some tough guy from New York or Boston to unearth the full range of its stupidity, profligacy and petty vindictiveness. Until then we are free to guess that several hundred officers are diverted from less urgent duties to protect us from marauding 64-year-old Green peeresses with the potential to wield bicycle clips and soya-based meat substitutes with evil intent.
Spare a thought for these public servants. None joined the force to do such demeaning work.
They were not motivated to don the helmet to keep tabs on John Catt, an elderly Brighton man who, like Jones, has no criminal record, and whose legal case against them she supported. Last year the Court of Appeal judged that the Met had unlawfully recorded not merely his presence at 55 protests, but his dangerous habit of sketching scenes from them. Mr Catt is 89.
Whatever reasons the domestic extremist unit's finest had for joining up – the uniform, the sirens, the Spanish practices, the chance to park on double yellow lines outside McDonald's with impunity, the occasional ruck, even perhaps a desire to serve the community – they cannot have included monitoring the most harmless and obviously well-meaning of their fellow citizens.
The work must be as staggeringly dull as it is pointless, and the sense of worthlessness so overpowering that you could not resent them if they cleaved to the policing tradition by retreating to their sofas for 12 years on full pay due to stress.
It needs no spelling out that there is a sinister tinge to this. The surveillance of those without a speeding offence to their name is hardly one of those "British values" that Michael Gove would wish to be taught in schools.
But while there may be a frisson of excitement to be had from the knowledge that one is being covertly watched for no sound reason, there can be only quiet despair in doing the watching.