People think that criminals usaully kill for revenge but sometimes they don't actually want to kill, some of them only kill because someone is in their way or someone is calling the police. ometimes they might kill because someone is videoing them commiting a crime and they don't want their face on social media or don't want that person showing the footage to the police.
Sometimes when people see a crime happening, their more interesting in videoing it to get likes on social media rather than calling the police; that is what could get them killed. Because they are trying to get close to the crime to get better camera footage, they are getting closer to the criminal. The criminal doesn't mean to kill them but it is their fault, they should've called the police rather than just film it to become popular.