First and foremost, absolutely fuck fiscal austerity and laissez-faire, there is nothing natural about this, only consequence of shit political choices, such as scraping environment disaster prevention, basically no relief efford funding, global warming denial and shredding of environment protection laws.
It is both. Global warming will make these incidents more frequent. And there's the corruption and negligence of the bourgeois government, which treats whatever is of public use like shit.
In Brazil we are very much used to hypocritical, greedy, sadistic and corrupt politicians.
Every couple of years theres floodings in Rio Grande do Sul. If they dont invest in infrastructure you cant blame global warming for it
You can't blame climate change for the flood itself, but it is part of the reason one of the rivers reached 30 meters tall, the highest recorded in there.
And since capitalism is to blame for the current crisis of climate change, it is connected with this tragedy.