Good Space simulator with rubbish story

Rating: 1/10 (1 December 2014)

Do not read this if you want the film to be ruined for you:
my great wonder is: why would you travel back in time and change something, when the purpose is survival of humanity? So if Cooper saved people from the fifth dimension, opened time hole and engineered the entire sequence of events whereby Cooper directed his past and his daughter about how, basically, can save humanity, how were these future people saved exactly? Which is to say, you can not travel back in time and instruct your own salvation. Should we not be saved 1st, so that one can exist in the future to travel back in time? How can you make such a big film without thinking of such a thing or is it me who has missed something?