Iconography is considered to be a branch of history. The image that painted from a society often represent the social situations or culture that were popular by the time it's made. Which mean by studying such images, historians could obtain valuable information regarding social events or how people at that time think.
there are many reasons behind it but some of them are:. due to weak financial status, poverty,lack of proper education and awareness,lack of support or guidance from family members, unemployment etc.