Is the problem simply that politicians don't have a clue?
Much as some (many? most?) members of the public confuse Google with "the internet" and misunderstand the way things are plugged together, I get the distinct impression that the same is true of politicians, even those who have been put in charge of departments with specific responsibilities. I've long felt that having an education Minister with no experience of the education system other than attending Harrow thirty years ago (I generalise, but you get the drift) is a contributing factor to the utterly confused policies successive governments have had towards education in the UK, and similar arguments could be made for those with responsibilities for transport, health, defence, the environment and so on and so on.
It probably (in the UK at least - I believe some other countries might be better) stems from the sheer lack of suitably qualified candidates. There is a disappointingly small proportion of MPs who have qualifications or real-world experience in anything other than Politics or Journalism.
It has undoubtedly been entrenched by the tendency of those in charge to promote their mates - who probably went to the same school and likely as not studied the same courses at university, or at the very least joined the same cricket or rowing club.
It has definitely been exacerbated by the hostility of recent governments towards "experts", but I'm afraid this part of the equation has been around for a very long time in the general "PHB class" - in my very first (proper) job after leaving university, I was told by the newly-appointed "station manager" (i.e. top bod in the building), who had rather rapidly and unwisely been promoted from sales droid to head of sales and then to overall head of the outfit in the space of a couple of years, "I don't want you to tell me it can't be done, I just want you to do it!" It was rather difficult for me - as very much the junior in the building - to explain that I wasn't saying it couldn't be done at all, but that it couldn't be done as quickly and easily and cheaply as the manager wanted.
It's one thing when that attitude means that the manager's office has to "make do" without the fancy new 12V string lights to impress visitors for a couple of months, it's a completely other thing when it means that ministers ram through legislation which could have (and often does have) far-reaching and long-standing consequences, probably more so for the proletariat than for the ministers themselves.
Perhaps what we need is some kind of children's TV-style induction course for new ministers.
"Good morning minister. Now, it may seem like magic, but actually there is some very clever engineering behind the systems which allow you to take a picture of your cat with your mobile phone and almost instantly send it to thousands of other people. Oh, sorry, yes, 'engineering' is a very long word.
"Why don't we begin at the very beginning..." (cue cutesy tune)
Sorry, political rant over for a bit