The basic premise of the movie is drawn from a philosophical/scientific argument on the risky consequence of unchecked progression of technological civilization. In the beginning we find that a massively diminished human population has turned into an agrarian society, shunning technology for the most part. The reason given is that shortage of food has led to a situation where NASA's trained pilot is forced to take up farming. From a philosophical perspective there could be another reason. Enrico Fermi proposed in response to the question why we haven't encountered any form of communication from extra-terrestrial civilization (in the famous Fermi Paradox) that one of reasons could that an intelligent civilization that has developed technology for space travel would also have developed the capability to self-destruct. This seems all the more true when we look at our history to find that we developed the atom bomb and nuclear arsenal for MAD (mutually assured destruction) before we landed on the moon. And I am not even looking at climate change scenario. For a world with hugely diminished human population and facing starvation ,the only way to avoid complete annihilation of the species would be to forsake industrial civilization and return to basic survival methods. It is not surprising that the school teachers talk about them being a caretaker generation and things getting better.

It is a father's love for his daughter that partly motivates Cooper to plunge towards the black hole from which he is sucked into the artificial construct in the fifth dimension and from where TARS is able to gather quantum data after observing the singularity. Cooper's love for Murph is quantifiable, the matrix of cubes, each representing six different views of Murph's bedroom in every instance of time makes it possible for him to navigate specific instance of time to send message by exerting force on world-lines of specific objects such as books and hands in a watch to create gravitational waves that affect these objects. Similarly, Murph's love for his father transcends space and time. Her father has been gone for more than 25 years and if alive is thousands of millions of light years away, but she is still drawn to her bedroom where both of them started investigating the anomalies and where she believes she can find the answers. And she does. She finds the quantum data encoded in the seconds hand of the watch her father had given her and decodes the message to complete the gravity equation so that the space station is able to take off and mankind is saved from extinction.
Originally posted by danish Ahmed in http://xpensieve.blogspot.in/