Article 19 comes close but is nowhere as clear cut as the US first amendment which actively prohibits the government from suppressing speech.

It's quite clear in the context of the Preamble, which literally says that the non respect of such rights by the rule of law means that "man" is compelled to rebellion.

That's too vague and soft and not strong enough to generate any controversy.

Everyone assumes for granted that there are limits to that. Your freedom ends where mine begins.