Tech Theft

[ElephantU]

Sounds a lot cheaper than building nuclear missiles...

 

[CaptBoulanger]

It is cheaper, but it doesn't always work (and not just due to SDI), AND it's sometimes harder to get the spies to the enemy cities (esp. if you're fighting across an ocean).

And, I'm not eniterly sure, but it might cause an incident even if you fail.

 

[Dark Ascendant]

Even if you do succeed in nuking a city, unless you're at war with that civ, everyone gangs up on you.