Has a consequence
The cause's effect
I walk to the shops - I cross the road - he waits at the light I turned on
He's late - his phone rings uselessly on his desk - she answers it
Which means that
She tells them to try later - the caller gives up - finds someone else.
The someone else, he stays with her - he isn't there to stop the fire - and a whole bright life is gone.
Ripples - they spread.
But then, I should never go out - do nothing - then I can't be the cause
Me not being there has just as much of an effect
Think about it.
You can touch a hundred people's lives
Simply by existing