But the Brazilian constitution does care for both these things.
That's why it requires special care during the elections in order to prevent abuse. What's at stake is a principle you find in every liberal thinker since modern times, and that grounds most (if not all) democratic constitutions worldwide: If there's no fire in a crowded theater, one can't shout "Congressman X started a fire! Run!", incite people to leave in a hurry and later claim that "I was just manifesting my political opinion, people were free to ignore and judge the situation for themselves", as if you were not expecting their panic and the risks associated with crowds in panic. You're responsible for whatever ensues, and if this kind of behavior can be preempted, it must be. Or so thinks pretty much every democratic country in the world, not just Brazil.
If we judge by the rule you mention, this would be censorship. That would mean there's probably no country in the world that could be considered democratic (even the so called "absolute" US freedom of speech is something of a myth, for there are lots of decisions from the US Supreme Court that would be deemed "dictatorial" according to the criterion you present here).
Bottom line is: Brazil lives under the rule of a democratic constitution built after much fight against real dictatorship and real censorship, not the rule suggested by you here (which, again, absolutely no country in the world lives by). You're free to disagree with the basic liberal and democratic principles grounding the Brazilian constitution, but whenever you and the constitution disagree, bear in mind that it is the constitution's point of view that's going to prevail.