What's the use of a
nuclear weapon - a weapon strongest of them all, if the enemy know you will never use it? This is where I think, the popular thinking in Western political circles diverges with the cold logic of warfare.
What is the best way to scare your enemy with your commitment to murder him using overwhelming force, than... to start doing so?
The politicians and people reading political science may thing the other way around, war does not work the other way as shown by thousands of years of history.