Stumbling Block

Walk slowly, walk carefully
The road is littered with mines
They will surely find your footfall
You can't avoid it
Walk you must, walk you must

When you plant your weight
On the detonator you will be
Shocked, surprised, unbelieving
Not because you didn't know
It would happen

You won't understand
Why now, why here?
What made this time and place
So explosive, so painful
So unexpectedly?