Neither I nor the people who got attacked blamed the hippo. They were on a guided tour with other people and tried to avoid coming too close. I would say that you would expect to be relatively safe when being guided by people who deal with such situations regularly. Such things can just happen. I would not blame them for being too reckless

The article states that they did not engage the hippo and tried to stay away. They also never blamed the hippo for displaying their natural behavior by attacking them. Shit happens.