Passion and The Natural Selection

There´s something very paradoxical in passion. It´s certainly a very important factor in the reproduction of the human species, because it joins people; and yet being passionated, and so making or thinking stupid things beucase of it, can be a terrible disadvantage to let one achieve what he wants... this can be ultimately bad to the species objective of reproduction...

The question is: If passion can be such a disadvantage, how did it survive millions of years of natural selection?
  Posted at 00:08