Yes, they do!
In some cultures, helping others is required, especially in the collective cultures, and some cultures have deviced complex cultural norms to do that, for example Chinese guanxi is a "debt" one person has with another because this other person helped them before - and that person is expected to help them now.
On the other help, in some other, moslty individualistic cultures, helping others might be seen as accusing them of a weakness, so people are very cautious when doing so.