People seem to be more helpful to strangers in smaller communities, where there are fewer other people who could render aid, and where the consequences are perhaps more dire.
In a big city, meh, there's always someone else who could do it.
What is everyone's responsibility is no-one's responsibility. There are psychology experiements that back that up. Google 'the smoky room experiment' and 'bystander effect'.
In a big city, meh, there's always someone else who could do it.