I'm glad you got to visit the museum before it was destroyed.
Years later it turned out that some originals were put up for auction since they were alive and well in some private collections. Many times the original is not displayed for the public anyway and a very good copy is used instead. So someone in the museum got money for selling the originals while the copy was still on display, then got money from the insurance, with the fire covering up everything perfectly (either by accident, or for the insurance money, or to cover up the fact that the originals went missing).
Of course this would just confirm the corruption or poor maintenance arguments.
Could you expand on this, or maybe give an example?
I don't know when it started but it's part of the government's culture now. It's common knowledge too: people talk about institutionalized corruption openly, citing investigations, comments by officials and even judges. It's a systemic problem and I have no idea what people are supposed to do in order to fix something like that. It's very demotivating and demoralizing.
This is actually a huge reason why lots of people want the military dictatorship back. The logic is (1) the military cares about Brazil and believes in the country's potential, and (2) they will do whatever they believe is necessary to make the country great, regardless of any individual's interests. Our history with dictatorships doesn't quite validate that logic, obviously.