One which forbids use of the software for weapon systems
As an exercise, write a sentence that bans Lockheed Martin from using your software ("in defense of the country, even if the war takes place in Iraq") while allowing a hacker in Syria to use it in a security system protecting a school for orphans. Weapons aren't inherently good or evil; than can be used to invade or to protect from invaders. How do you draw a line between those in an unambiguous way?
What does that even mean? Installing a keystroke logger on my wife's laptop so I can keep tabs on her would sure as hell be a privacy invasion. The police doing the same under warrant to a suspected criminal probably isn't. Again, your challenge is to succinctly describe an algorithm that permits the second while denying the first.
I'll save you the trouble: both are impossible, and no two groups are likely to agree on what is "good" and "evil". I love the FSF but I'll be damned if I want to make them the sole arbiters of what uses I can put GPLed software to.