Well, I am wondering why you used two different tenses in the clauses:
Si ius exprimendi evanescit (praesens), libertas peribit (futurum I).
Well, I know that is how we express the conditional in English, but in Latin it doesn't work in this way... I propose twise "praesens" or twise "Futurum I", or you can also create here "modus potentialis" with appropriate "conjunctivi"...