I think there was no other way.
If Haddad wins, almost HALF of the country had already been brainwashed, manipulated, and would be keeping pushing their ignorant agenda until Haddad was taken out of the seat.
A lot of people will suffer, but I don't think any campaign from the left would have enough influence to revert the manipulation.
Bolsonaro winning is the ONLY way for women, black people, poor people, or any other victim of his speech that voted for him, to learn. they will only learn by the hard way, THIS is depressing... a lot of people to suffer for this to be fixed.
Had all victims been smarter, plus allies, he would had no chance of winning.
Manipulation on online platforms is the problem, and we know since forever that there is no way to fight that, every opposition to that is outdated, and at least 10 steps behind. Until people starts to care more about real life actions than social media rumours and fake news, we are all under their thumbs.