This isn't a US-specific problem, a lot of Europe and the Anglophone world at large is experiencing issues like this. It feels like the last two years especially (but a fair bit leading up to it) have utterly destroyed my trust in not just the political institutions in the UK but a lot of other ones I'd taken for granted in the past too. I genuinely feel like we've become perhaps not a banana republic but certainly a banana kingdom where corruption is the norm and the government exists primarily to serve the powerful rather than the people. We're literally at the point where the Prime Minister can openly flout the law and lie about it to the Mother of Parliaments without consequence, where there's apparently no meritocracy whatsoever in how politicians are appointed to high office, and policy positions are in lockstep with predicted media response rather than any notion of public good. The tail has wagged the dog right into oncoming traffic.
All governments will use (or abuse) the powers they have to the absolute maximum extent they can get away with which is why subsidiarity is so important. The less power any individual has, the less damage they can do by using it as a tool for their own self-interest and the more they're forced to build consensus with other influential people which limits extremism. If it were up to me I'd abolish the office of Prime Minister altogether in favour of strong Cabinet collective responsibility and I'd also create an anti-corruption body completely outside of Parliament and the other institutions of state with wide-ranging powers to seek and punish misconduct in high office. Political office is an absolute magnet for people with unpleasant personality traits, instead of assuming good faith in politicians we need to assume bad faith and build the machinery of government defensively to accomodate this.
Another remedy to our issues is abolishing general elections in favour of rotating, asynchronous by-elections. This would give us exactly the same amount of democracy, but it means that the media's influence is massively reduced due to a lack of national election campaigns and it also means parties are forced to stick to their manifestos as they're effectively forced to campaign locally at all times so pulling a Nick Clegg becomes much more risky. As well as preventing the election result essentially being a function of how good the media strategy is, it also means the makeup of Parliament changes much more gradually which allows for long-term planning instead of the insane pendulum swinging where nothing gets done if it takes more than five years.