I'm guessing the neighbors include the oposition in the decision making and they might have more of a state policy in place, unlike here, that everythng is political policy(no viva peron, no job for you!)
I think it is more complicated than that. First, although most of LATAM is more about people than about laws, Argentina in particular the personality cult is much stronger than anywhere else. So here more than anywhere, the laws take the backseat to charismatic leaders.
I can't speak of Chile, but Brazil's new (1988) Constitution did an outstanding job clearly defining fully separated and independence powers. Also, the Constitution put in place very clear and rigid rules on how employees from all branches of government are to be hired. Basically for any non-cabinet position to be filled, the only criteria for hiring is a battery exams that must be made public and available to any qualified candidate. And that exam, plus any background checks, are to be the only criteria for hiring. So, if you want to be a public prosecutor, you have to take an exam with tens of thousands of other aspiring candidates, and the highest scores are the ones who will be hired. These exams have to be publicly announced (newspapers, radio, etc...) so that any qualified candidate in the country can participate, and are conducted by an independent 3rd party and audited by an independent 4th party. The ones who get the highest score plus pass on the background tests are the ones to be hired, no if, ands or buts. That is the only way in, and politicians have no influence whatsoever in the process. This means that all public prosecutors, judges, inspectors, police chiefs, police agents , etc...got their jobs by passing an entirely objective exam while competing against thousands of others. There are no political appointees and political affiliates. That is why the police is arresting the leadership of the Worker's party left and right. They have no political affiliation. Many of them were nobodies who studied their asses off, passed the exam and became police agents, police chiefs, judges, prosecutors, comptrollers, auditors, etc...So they don't give a crap. They owe nothing to no one. They were not politically appointed, so they can't be politically fired.
I think that plays a HUGE difference on why the institutions in Brazil re working right now.