A complete stranger has the capacity to alter the life of another irrevocably. This domino effect has the capacity to change the course of an entire world. That is what life is; a chain reaction of individuals colliding with others and influencing their lives without realizing it. A decision that seems miniscule to you, may be monumental to the fate of the world.
If I knew then what I know now I guess it'd make no difference; Fate's sure in the way somehow. What's important is the essence. Although we still have free will We also have a whole lot to deal.