This is an example of the bystander effect. The people walking in this video have several reasons not to help them man lying on the ground. The reasons range from giving excuses for his behavior ("he's drunk"), which to them is not a really important reason to help him, to putting the responsibility on others ("I'm sure someone else will handle it").
How can we help stop rape culture? By consciously challenging the “bystander effect” and understanding when a situation is not consensual. There are many ways for a bystander to intervene that doesn’t necessarily include direct confrontation and it is important for people to take action when they can.