“Even big strong doors depend on small hinges to move – details determine destiny!”
“It has been said that the gate of history turns on small hinges.”
These sayings are kinda Churchillian aren’t they?
But they are not incorrect.
“For want of a nail the shoe was lost.
For want of a shoe the horse was lost.
For want of a horse the rider was lost.
For want of a rider the battle was lost.
For want of a battle the kingdom was lost.
And all for the want of a horseshoe nail.”
“If the camel once gets his nose in the tent, his body will soon follow.”
All these describe situations where permitting some small undesirable situation will allow gradual and inexorable worsening – the so-called “Butterfly Effect.”