Why is the government of the UK such a disaster? (Knowing the myriad of reasons the US government is also a disaster, I don't imagine this is a simple answer.) But from outside looking in...it appears that the Conservative party is wholly incompetent yet....keeps getting elected...and the Labour party is simply unable to get a majority because...reasons?
Putting together a detailed explanation for the absolute omnishambles that has unfolded over the past few years, months and weeks (in particular) requires an eloquence and weary experience that I just about lack (at the time of writing!).
To put it simply, one of the standout reasons is that in the space of the aforementioned weeks the latest PM + her cabinet, which was selected seemingly on their boot-licking ability, tried to play fast and loose with the economy, the rotten cherry being tax cuts (effectively) for the rich at a time when millions in the country were/are about to get shafted by ballooning energy prices. Oh, and they didn't provide any numbers for how they were going to go about "it" (the "mini-budget"), so the markets freaked out, borrowing/mortage costs jumped and Sterling plummeted to its lowest level against the $.
And lest I forget, this government and their rather delusional mandate was NOT elected/voted for in a GE, only by a very select minority of the public i.e party members. Boris Johnson acquired that mandate in Dec '19, who had (and still has) the affection of large swathes of the country due to the persona he had cultivated over the preceding years (and still has it, despite being turfed out this Summer as a result of Covid Lockdown... shenanigans, among other issues). It helped that he was running against Jeremy Corbyn but that's another kettle of fish entirely (and not something I want to delve into at 1AM

).
As of a few days ago, Labour currently have a 30+ point lead over the Conservatives (opinion polling, so take it with a grain of salt). If it comes to a General Election by the end of this year, the Tories have a snowflakes chance in hell of staying in government...