They adopt a posture that's part aristocratic disdain and part disbelief: police exist to hassle other people, surely, not people who have read Dostoevsky and know how to hold a knife and fork.
You get this too with fraudsters who are suddenly called to account, and with bad drivers.
Perhaps it was this instinctive understanding that made Act leader Don Brash, keen to slash government spending, moot legalising cannabis and make dope-dealing okay.
That might be the one politically appealing idea Brash will ever come up with that could attract old stoners though, unfortunately, they are the last people who would ever vote for him.
Rick wants home detention, and who can blame him?
He has a music room at home, and creature comforts, and could easily pretend the whole darn court thing had never happened.
Prison is not a nice place. He knew that already. Its unpleasantness is meant to be its point.
But his arguments could only have been dreamed up by a white middle-class offender who had woken from a bad dream only to discover he was living it.
No Maori, let's say, the 12 per cent of the population who make up half this country's prison population, would dream of appealing on the grounds - among other things - of not belonging there because you don't get enough sunshine and you don't like air conditioning.
What made me think about this is Hone Harawira, who snarled about the appalling Maori rate of imprisonment on TV7 the other night. I wonder how successful Maori are at getting home detention.
Harawira is hard to take but often right.
There is something seriously - tragically - wrong with an education system that fails Maori in their droves, effectively consigning them to jail, the logical next stop for people who are unskilled and unprepared for the real world of work.
There's also something very wrong with our complacency about the situation.
Surely we have to ask Maori what they think and how they feel about this, and support them in dealing with the problem their way.
We have to abandon the idea that this would amount to giving them special privileges, or arguing about the cost of any initiatives.
Imprisonment is unbelievably costly in both human and financial terms. We're already out of pocket.
But to revert to a real national tragedy, there's Dan Carter being sidelined from the World Cup.
Only a fortnight ago I complained on this page that I'd tired of his over-exposure, literal and figurative, and had come to resent seeing him so often in his underpants.
Surely the psychic power of my thoughts is not to blame for his injury to the very area I had in mind.
I'd hate to be the cause of anyone's groin becoming afflicted.
