> How? They're all a collection of pompous, self-obsessed, talent
> free clowns, with no relevant education or experience
One of the core problems with politics is that democracy and psychology can combine to produce problematic outcomes.
Most people vote for politicians who appear the most confident and certain in their beliefs. In an increasingly complex world, confidence and certainty are reassuring characteristics in leaders. Therefore we end up with politicians who are above all else confident, regardless of their actual ability or knowledge. Most voters probably don't mean to choose a brash ignoramus to represent them (and not every MP is one) it's just frequently a side-effect of how the system works.
But the Dunning-Kruger effect means that many of our leaders are over-confident in their own abilities and understanding. If they aren't aware of a particular threat or problem then they don't see any point in doing anything about it and it wouldn't occur to them to ask anyone else because they are already convinced that they know everything (e.g. see Gove's remarks about experts). In the abstract they know that national security is very important, but most of them don't know how that translates into technical and administrative controls.
There are a few good smart people who manage to get into politics, people who listen to others and seek expert input before forming opinions and policies. They just happen to be the minority exception to the general rule.
For these reasons it's unlikely that lessons will be learned by everyone who need to learn them. However, that doesn't mean we shouldn't try to educate our politicians to do better. Also we need skilled experts to design and implement better systems, in order to be less reliant on the knowledge and whims of the individuals concerned. I'm going to hope for the best, while still dreading the worst (as per usual really).