Jair Bolsonaro is called the "Donald Trump of Brazil", but that totally undersells just how scary this guy is.
Consider some of the controversial things he's said.

June 2011 -- “I would be incapable of loving a homosexual son,” Bolsonaro said in an interview with Playboy magazine. “I won’t be a hypocrite: I prefer a son to die in an accident than show up with a mustachioed guy. He’d be dead to me anyway.”
October 2014 -- "She doesn’t deserve to be raped, because she’s very ugly,” Bolsonaro said in an interview with local media, referring to a fellow congresswoman. “She’s not my type. I would never rape her. I’m not a rapist, but if I were, I wouldn’t rape her because she doesn’t deserve it."
April 2016 -- “For the memory of Colonel Carlos Alberto Brilhante Ustra, the terror of Dilma Rousseff [...] my vote is yes!” In Brazil’s Lower House of Congress, Bolsonaro dedicated his vote in favor of President Rousseff’s impeachment to the Army officer who oversaw torture for the dictatorship when she was imprisoned.
April 2017 -- In describing his visit to a quilombo, as communities descended from escaped slaves are known, Bolsonaro characterized residents as fat, citing a unit of measurement reserved for livestock. “They don’t do anything!” he continued. “I don’t think they even serve for procreation anymore.”
September 2018 -- “We’re going to execute the Workers’ Party members here!” Bolsonaro told a cheering crowd in Acre state, on the Venezuelan border, after pretending to fire a machine gun. “Let’s run those crooks out of Acre! Since they like Venezuela so much, they’ll need to go there!”

This violent animal has been given a 70% chance of winning the presidency.
The thing is, while those statements are controversial, they aren't his scariest statements.

More than half admit that they would “go along” with a nondemocratic government if it “solved problems.” (Mr. Bolsonaro is among them. He is also on record saying he would not accept the outcome of an election where he is not declared the winner.)
...Mr. Bolsonaro and his running mate are proud apologists for the military dictatorship that reigned from 1964 to 1985. He once said that its only shortcoming was that it had not killed more people. His team also supports violently repressing crime: He openly supports expanding police powers to use lethal force, reducing the age of penal responsibility from 18 to 16, and bringing back the death penalty. He advocates for greater religious involvement in public life. Last year, he declared that Brazil is a Christian country; that there is no such thing as a secular state; and that those who disagree should leave or bow to the majority. He has received repeated denunciations from the attorney general for propagating hate speech, and is openly hostile toward Afro-Brazilian communities, indigenous populations and members of landless movements, whom he has described as terrorists.

After Bolsonaro takes office a lot of people are going to be killed/disappeared.
I don't know how Bolsonaro's supporters can vote for that.