I did read them and they are just vague speculations, not a single shred of evidence of American interference is given just feckless speculation. You may not know me well but I'm a fierce critic of America and am well aware of its inexcusable history of meddling in Latin America. I would be the first to criticize American meddling but there is no evidence that the US has meddled at all. And on the scale it would need to have there would have been some. This is essentially a popular uprising by Brazilians fed up with the worsening economy and the corruption scandals. The US could not have won all those hearts and minds with its influence gone undetected.
With all due respect you simply do not understand the political dynamics at play. I grew up there and lived through the transition to the workers party. I am well aware of the indignant reaction by the upper class of Brazil and their steadfast rejection of the sudden shift in political power. Lula was a firebrand socialist who they had legitimate concerns about taking office after all the work FHC's administration did to stabilize the economy and it was still on shaky ground having just unpegged the currency.
One of my first posts on a2k was about these concerns that Lula, whose party had been seen like tea party fringe extremists and populists, were now in charge. I had to admit in a few years that I was wrong, Lula governed nothing like his campaign rhetoric. Didn't nationalize everything and largely continued the fiscal reforms FHC started. They added a social program component that helped up to 30 million people out of poverty.
I realized my fears were wrong but yes, the rich Brazilians were vehemently against them. But not because of some pro US vs anti US dynamic, it was classism they were mortified that the working class party had control. Brazilians of all classes tend to like Americans and American culture while being deeply wary of American government (due to our Latin American misadventures and the geopolitics they saw as being bullies). While the upper class is slightly less anti American (mainly just due to their visits to Disney World and shopping in NY) they are not "pro American" generally.
Brazilians of all classes would deeply resent any American influence into their internal politics, describing it as a pro American issue is really not accurate. This was more about internal class warfare in culture that never stopped since PT came to power.
Lula was a very charismatic leader, compared to the technocrat that is Dilma, and presided over a period of growth. He appointed Dilma as his successor and was popular enough to get her elected (though she lacks all of his political skill). After the car was scandal with billions of dollars of bribes bring paid to hundreds of politicians came out the economic troubles combined to bring millions of people to the streets calling for their leader's heads. The bus fares were being increased while their economy tanking, and they had to hear of billions in bribes stolen from public funds and lining the pockets of politicians.
When Dilma's budget irregularities came out it gave a legal instrument to actually call for her impeachment and many of the house members who support it were themselves under investigation for serious corruption so this was a good way to deflect attention. Her replacement, Temer, who is prohibited from campaigning for corruption turned on her and opportunistically saw this as a way to seize power and deflect from the investigations. After all there is some immunity for some positions. Dilma even tried to give Lula a cabinet position to shield him from prosecutions just before being impeached.
All of this shows plenty of internal motivation for the internal dynamic, but when you look for reasons the US would want to overthrow the government things get to be quite the tenuous stretch. The conflicts with the US were largely rhetorical and the US simply does not have enough interests at stake yo care that much, and the result of the impeachment leaves utter chaos that they can't predictably assume will resolve to American interests.
There is not a shred of evidence of US involvement in this political upheaval, and it is an enormous one with the entire public involved, it's not like they can turn a few people they would have to have the majority of both houses in their pockets along with the unknown judge who will adjudicate it and also manage somehow to get Dilma to admit to an impeachable offense.
The likelihood that the US could cause all these conditions to be so is astronomically small, and that it could do so without a trace (which would infuriate neatly all Brazilians) even more so. And when all is said and done there is little to nothing to gain even if all things turn out the way the US wants while it's impossible to predict how it will play out given the enormous polarization and political chaos on Brazil.
There is indeed a class element to this but America does not have the capability of causing the combination of situations that resulted in this, nor the motive.
I do not find this outlandish because I disagree with it, I disagree with it because it is outlandish. And not all things I disagree with are so, this is just particularly obviously so.