I was just watching a holly wood movie "The Fast & The Furious" Aka "Tokyo Drift" and the mafia boss in that movie says one Japanese proverbs. Don't really recall exact words but has following meaning.
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 message was lost;
For want of a message the battle was lost;
For want of a battle, the kingdom was lost;
And all for want of a nail. . .
Same will be applicable for the Software defect. Defect might seems like a nail but you may ending up loosing kingdom here its whole software. :P
P.S. Fighting with Cheater in day time....leads me to write this down. It's really fun to fight though i know i never going to win.... :p