Girl. He doesn't. It's not like he was taking selfies with the victims like "look y'all!! I'm a good person!!" He's Justin Bieber and people are gonna take pictures of him whether he likes it or not. He told them that he didn't want any press.
He's making sure to let everyone know what he's doing. It's tacky, imo. Every time he does something for charity, there's always photos and a press release. That's not doing something 'cause you want to, that's PR.