Origin of depression.

As babies we cried to get a parent to attend to our needs of hunger, we saw how it worked and did it to get care and love. then when that kid grew up he/saw he could do the same to get toys, later on a bike, a phone, but after, when now the things he wants are not possible to be given by his/her parents then the person cried and nobody came to stop it, perhaps they were waiting for god to come, but this misery prolonged and caused depression. A behaviour learnt in childhood made its way to adulthood, it doesn't work, because nobody comes to solve your problem, and if prolonged turns into depression and ruins you further. How silly of an origin for something grave as depression.