My findings

In June 2000 Sandro rosa took a bus hostage and threatened to kill everyone but didn't intend to kill or hurt anyone, there were police on the case but they gave up and just left, he only said that to scare the people on the bus to protect himself from getting arrested and he told his hostage to pretend he shot her. He pretended to kill a woman he asked her to pretend to die and she did it willingly  and threatened to murder  another one and left the bus with the hostage and the police men that had given up to work I the case earlier waited outside and attempted to shoot him but shot the woman and he shot her 2 more times out of fear, and then she actually passed away.

What Sandro did was wrong, but he was driven to do this because when he was only 6 years old his mom was stabbed to death and killed right in front of him leaving him traumatized for the rest of his life. What I think is that Sandro felt he had to do the same to someone like they did to his mother as when you are traumatized, sometimes your brain can take over without realizing  you will do anything to get revenge.

Sandro should have not even went on the bus in the first place and he shouldn't have tried to kill anyone as justice is always better than revenge, even if his brain was taking over he could have asked for help or went to the police to help him sort out his problems but I don't think killing anyone was the right thing to do because it can all go wrong and get others killed. I think what he should have done was totally ignore what his mind was telling him to do and go the right way not trying to kill anyone.