No we can't. Because my opinion is that a government
should punish speech in certain cases, e.g. speech that is against the human dignity of other people or speech that is dangerous (e.g. yelling "Fire!" in a crowded theatre.
We delegate these rules to governments to secure the individuals rights to life, liberty, and happiness (as your declaration of independence so wonderfully puts), not because we want to allow shitheads to allow to shittalk. This is just a side-effect we all have to endure, because we don't want governments to police all speech.
That means also in the US not everything you could say goes unpunished by the government, especially if you're not white, male and christian. Remember, the police is part of the government and if they can shoot you because they thought they have seen a gun, they can also shoot you because of what you said.
On top of that we, collectively, form governments for (among others) the purpose of protecting each others speech, not just from governments, but from each other, from our bosses, coorporations, from the police. That means, we collectively, use the government as a governing body tho whom we delegated certain powers. Where to draw the line is different in different regions of the earth. For example the female nipple printed in many European newspapers would not be protected speech in the US for puritan religious reasons.