Frankly, freedom of speech has it's advantages, and just like any other political decisions, those advantages based on that specific case and the likely effect must be weighed against any proposed advantages to limiting speech.
People often say something to the effect that giving government any kind of ability to limit freedom of speech we don't like opens the door have them eventually ban speech we consider necessary. I don't necessarily agree. We have all kinds of limits already, and other parts of the world have even more without devolving into totalitarianism.
As mentioned before, we have a system for addressing libel and slander.
We also have laws against harrassment, and restraining orders that limit who you may speak to.
We have the FCC which limits speech in certain venues.
We have the FDA and many other agencies limiting what corporations are allowed to say about their products on packaging and in ads. Note recent actions against Cheerio's for making unsubstantiated claims about health benefits, and against drug companies for promoting secondary usages for their drugs.
Some communities have local laws against certain kinds of obscenity in public places.
All states have laws against you screaming out your free speech loud enough to disturb people.
So we already have laws that limit, the content, venue, tone, truth value and even volume of our speech, many of these federally based.