politics

I'm no big fan of the Democrats, but historically they are willing to get rid of their own when even accused of wrongdoing. See Senator Al Franken for the silliest example of this.

Republicans will not, in the vast majority of cases, do the same.

So basically politicians in the ruling government

Well yes and no. If you are thinking of it like a parliamentary system don't. We don't require the formation of a government through a majority party of coalition.

Each representative is elected to an existing body and they have to figure it out.

So theoretically you can have multiple combinations on which party controls the House of Representatives, the Senate, and the presidency. Honestly we don't even have to have parties you could have every seat filled by politically unaligned independents.

Currently all elected offices in the federal government are controlled by the Republicans. They will not remove their own party's president.

But theoretically in the mid terms the democratic party could become the majority in the House and the Senate. The president would of course still be the same. But they could then attempt to remove him from office through impeachment.

It's a confusing mess, but yeah that's the US system

The problem is that you have a majority on the Supreme Court that are blatantly abusing their power and ignoring the law when it advances their side's agenda, including just declaring the president to be above the law.

This would be the kind of thing that should lead to impeachment, but that requires a supermajority in the senate (because you don't want whichever party has a majority to be able to easily abuse the impeachment process) but that won't happen because every single republican with even a hint of integrity has been pushed out by Trump over the past decade. And even if there were Republicans that weren't entirely corrupt, dismantling your own Supreme Court majority would be a tough sell politically. And even if they did remove the existing justices, it would just mean that Trump would get to appoint new ones that would be much worse and with many more years ahead of them.

And with Trump filling the executive branch with the worst scumbags he can find, chosen specifically for their willingness to be loyal sycophants who won't let ethics or laws get in the way of doing his bidding, you aren't going to get any help there. Again, this is exactly why the senate has to approve appointments but they are also scumbags right now. And for the same reason, the impeachment that should be happening for basically every member of this administration are not coming.

All that being said, there is resistance coming from both the executive and judicial branches. This administration has been firing people illegally in part because it can't get them to do the illegal shit they want them to do. And those illegal actions and the related illegal firings have been taken to court and the administration has lost nearly 95% off the time. Sometimes the Supreme Court has stepped in to bail them out, but in most cases the ruling stands and the administration has eventually complied.

All of which is to say that, while there are many flaws both big and small in the American system, it isn't the system itself that is at fault here, it's the elected officials and the corrupt assholes they appointed. There is no system that will work when every branch of government is in the hands of people who ignore their ethical and legal obligations.