Because people have no fucking clue about how this country is actually run (a state of ignorance many politicians seem content with) and so have no idea about things like the Barnett Formula.
You mean that bit of pro-Scots / anti-Welsh and N Irish shit that idiot Joel Barnett worked out on the back of a fag packet in a motorway services when he should have been getting some beauty sleep? That Barnett formula? <Hysterical laughter ensues>
Sorry. I've been up all night and the BBC news channel have just dragged out a new version of the swingometer so I'm definitely getting a bit hyper.
BUT, But. Something I have noticed this time round which I suspect may indicate an underlying sea-change in UK politics. For years like right back to Harold MacMillan the first PM I actually remember I have been driven batty by those ghastly vox-pops where some housewife / labouring chap in the street is asked what the result of the election should be and utters those unforgettable words. "Well I think its about time we had a change". And it was a very powerful meme for the longest time. I can attest to its ubiquity over nearly 50 years of elections.
Now you can say what you like about the quality of political debate and the depth of political sophistication in the UK body politic but this time round nobody, not even fucking Joey Essex ffs, has suggested that we just need to vote for the political pendulum to swing back the way it just came from in order to alleviate all the nations political woes.