Another webcomic -- is/ought

So you all know my love for webcomics by now.
I decided to take a crack at an attempt at bridging the is/ought gap with Slither's logic. Please forgive any and/or all of this that doesn't make sense, I'm flu-y.

I. Liberty and safety are inherent rights of mankind. (IS)
II. Liberty and safety are equal to one another. (IS)
III. Liberty and safety, being equal, should go hand-in-hand. (OUGHT)
IV. Mankind is morally obligated to maintain and defend both liberty and safety. (IS(?))

Therefore: People who would give up liberty for safety deserve to be thrown in jail and tortured until they admit they are wrong. (OUGHT)