Tory consternation that Labour is encouraging its supporters to register for the Tory Mayoral primary election in London. According to the Tories, this is in order to block Boris Johnson, since they remain touchingly convinced that this person is a serious candidate. Frankly, it is much more likley to be the opposite, since he simply isn't. But either way, that's primaries for you. How is any of this wrong within the system in question?
Which is why I'm all in favour of primaries. Imagine if the two candidates with the most nominations from a party's branches for PPC or for Leader were then subjected to a binding ballot of every registered voter in the constituency or the country, and that this happened in the course of every Parliament without fail.
The sort of people favoured by central machines would struggle to get on the ballot at all, and certainly wouldn't be selected. And the same is true of each party's several lunatic fringes, who could always then put up under their own steam and see how far they got.