While I appreciate your view I don't know where you live or who you are and I bet there is a group of people out there that hates you, and you would have a different view on freedom to publish the on google / Facebook when they target you
Unfortunately here it's clear that life is far from perfect, but the moral question to ask is how can we make the best of it for all people? Should we ban everything because a few die: cars, sugar--what about swimming pools? Back flips? You see, I don't think this argument you made logically leads us to a very good world. Government can't protect us from everything. At some point we have to rely on faith in humanity. Not to mention with every power handed over from the people is given into the hands of government's propensity for corruption...
So while I don't approve of every group that will use free speech same as I dont use marijuana or have a swimming pool, but I don't think it's a legitimate role of government to regulate any of that.
In other words, I think more people will suffer w/o free speech than w/ it, but no solution will be perfect.
Ok, however your second paragrapah is really concerning me.
In a way, speech is already a very effective democratic institution. The more decentralized and the more participants, the more democratic. But if this voice is transferred from the people to the gov, the more power is handed from the people to the elites, and most likely the faster we will devolve into authoritarianism.