The bystander effect states that if someone is in need of help, their chances of getting help decreases when the number of people increases. The most famous of which is Kitty Genovese.
So let's say you and a large group of people see someone get stabbed and lays dying, how likely do you think you would be to help?What if you had you children with you?
What about if it was an animal that needed your help? Say someone is beating their dog, how likely would you be to help?
There have been many examples of this happening in real life where someone is dying, and no one helps them.